A piece of glass, or other transparent substance, ground with two opposite regular surfaces, either both curved, or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects, or otherwise modifying vision. In practice, the curved surfaces are usually spherical, though rarely cylindrical, or of some other figure.
A transparent double convex (outward curve on both sides) structure between the iris and the vitreous humor. Two structures of the eye focus light onto the retina. The first is the cornea or front surface of the eye that provides about 65% of the focusing power of the eye. The human lens is located behind the iris and in front of the vitreous humor and provides the remaining focusing power for the eye. In younger patients (usually below age 45) the lens is able to adjust it's power allowing the eye to change it's focal length from distance to near.
Diffuser or refractor for a light fixture. Usually made of glass or plastic.
The portion of the eye that bends light rays and thus can focus an image on the retina.
Structure that bends light and focuses it on to the retina.
Latin = lentil - a transparent body with one or both surfaces curved to re-direct light rays, adjective - lentiform or lenticular.
The transparent biconvex structure of the eye that is located between the posterior chamber and vitreous body. The lens is living tissue, but is almost "crystalline" in composition and is "crystal clear". It is one of the driest tissues in the body, and therefore has low signal intensity on MR. image
A combination of glass or plastic elements mounted on the front of a camera and that focusses light on a sensor or on film.
Optical lens, essential for projection an optical image of the scene onto the front surface of the camera imaging device (a CCD for example). Lenses come in various fixed focal lengths or in a variable focal length (zoom lenses), and with various maximum apertures (lens opening).
The transparent body that is inferior to the iris and pupil and superior to the vitreous humor.
This is the device responsible for focusing the image on the CCD, and most offer adjustable focal length and aperture.
crystalline lens: The eye's natural lens. Transparent, biconvex-shaped tissue that helps bring rays of light to a focus on the retina.
Laser Engineered Net Shape A high powered laser is used to melt metal powder supplied to the focus of a laser beam by a deposition head.The build up of this powder on top of a substrate can be used to produce a solid part whose properties are as as good as if not better than the constituent parts. Created by Sandia LABS under the name LENS but marketed commercially as DMD, through Optomec. http://www.optomec.com
A combination of shaped glasses and air spaces set in a specific arrangement within a barrel. Within the lens is a diaphragm that can be opened and closed to allow in specific amounts of light. This is controlled manually by a ring on the outside of the lens barrel, or electronically via pins in the coupling ring that mounts the lens to the camera. Lenses have two primary functions: one is to focus light with as little distortion or aberration as possible on to film or sensor. Focusing is accomplished by changing the relationship of the elements in the lens to the film plane. The other function is to control the amount of light hitting the film by use of its aperture. Autofocusing lenses may contain small motors for racking the lens back and forth in response to changes in focus.
The lens of the eye focuses the light entering through the pupil, directing it to the retina. The curvature of the lens adjusts to focus at different distances.
the structure behind the iris of the eye. It changes shape to focus objects on the retina.
Transparent refractive structure that finely focuses images onto the retina for clear and sharp vision.
a crystalline structure located just behind the iris - it focuses light onto the retina
A transparent optical component used for focusing the incoming light image on to the light sensitive part of the camera.
Transparent or translucent cover for the face of a lighting fixture; diffuses or focuses light passing through it and protects internal components. Also called "refractor" or "diffuser." Usually made of glass or acrylic.
A piece (or multiple pieces) of optical glass that is shaped to focus an image.
Transparent optical element or assembly with either a concave or convex surface, which refracts light to form an image.
a transparent structure located just behind the iris that enables the eye to focus for various distances. Its function is similar to that of a lens in a cornea.
This is located just behind the iris, and helps to focus light. A "capsule" surrounds the lens "nucleus". The nucleus can become cloudy, and this is termed cataract.
optical element made of glass or plastic, capable of bending light. Protecting your Lenses
The attachment on the front of a camera that splits light to form an image on film. Different types of lenses may be placed on the same camera to create different effects.
A transparent, biconvex, nearly spherical body in the eye which focuses light passing through the pupil (images) onto the retina.
In a single-lens eye, the lens is a clear, flexible membrane. It can change shape to bend the light that passes through it, focusing the light onto the retina and creating a sharp image. In a compound eye, the lens is an inflexible, crystalline cone that directs light down the ommatidium, toward its light-sensitive cells (retinulae). The lens in a compound eye cannot be focused.
the part of the the camera that focuses on the rays of light to form an image
An optical device used to control and focus light.
An oval, transparent structure located between the posterior iris and the vitreous humor of the eyeball. It is connected to the vascular tunic by suspensory ligaments.
Accessory lenses come in a huge variety and are used for different things. A lens can be used to prevent glare, create a soft focus, intensify highlighted areas of light, provide additional water protection, or filter colors for a changed lighting effect.
A piece of curved glass that changes the direction of the light passing through it. In a lighthouse, the light passing through the lens is spread out so that it looks brighter.
Digital Video: A thin piece of transparent material (usually having a curved surface) that is used to focus the target image onto the image sensor.
Part of the optical focusing system of the eye immediately behind the iris. As individuals age, the lens hardens. This causes individuals older than 40 years old to develop a condition called presbyopia in which reading fine print becomes more difficult without eyeglasses or contacts.
Transparent glass or plastic that has been formed and polished to form a certain shape, usually spherical. When a beam of light reaches the area between the air and the lens, a part of this light is always reflected. The remaining light passes into the lens and alters its propagation direction, i.e. the light is refracted. The incorporation of various lenses (converging and diverging lenses) creates a lens system. When optimally arranged, they allow the subject to be presented correctly on the image plane.
Optical glass with one or both sides curved, the purpose of which is to direct light by concentrating or dispersing light beams.
a ground piece of transparent glass or plastic through which light rays are refracted so they converge or diverge to form the photographic image in the camera.
A glass or plastic element used in luminaires (fixtures) to change the direction and control the distribution of light rays.
A clear, flexible structure that adjusts the eyes focus, allowing us to see objects both near and far. It is responsible for about 20 percent of our focusing.
a clear structure that refracts light onto the retina. The lens shape is controlled by the ciliary muscles and suspensory ligaments.
Light modifier. Convex lenses focus and concave lens diffuse light waves.
The part of a camera that concentrates light and focuses the image.
Clear, flexible disk that helps the eye focus light onto the retina.
the transparent, dual-convex body which focuses light rays onto the retina.
the portion of the eye that focuses the light on the retina.
A lens is an optical device which bends light, focusing it on onto a image sensor to create a distinct, visible image. All video cameras (and still cameras) need lenses in order to obtain a clear picture. Lenses come in a variety of focal lengths. The focal length of a lens, in combination with the size of the imager, will determine its field of view.
Normal Lens: Any lens that produces an image in the view finder that is the same as what the eye sees is known as a normal lens
The transparent structure behind the pupil and iris. It functions to bend light rays so they land on the retina.
A shaped piece of transparent material (usually glass) with either or both sides curved to gather and focus light rays. Most camera and projector lenses place a series of lenses within a metal tube to form a compound lens.
A crystalline, biconvex tissue within the eye that focuses light rays upon the retina; this is the structure on which cataracts may form.
A light-focusing device.
a transparent optical device used to converge or diverge transmitted light and to form images
biconvex transparent body situated behind the iris in the eye; it focuses light waves on the retina
electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons
a device for concentrating or diverging light , usually formed from a piece of shaped glass
a disc shaped piece of optical glass that has been specifically ground into shape to magnify the image it reflects
a magnifying glass because it dilates , or spreads out from its centre, the objects seen through it
an optical component whos surface curvature and refractive index are designed such that the direction of light incident upon it is controlled
an optical device through which light is focused in order to form an image inside of a camera either on film or on a digital sensor
an optical device with such a shape that it converges every ray of light it receives from an object point to one point called the image of the object point
a piece of glass or any other transparent material with two curved surfaces, or with one curved and one flat surface
a piece of glass or some other transparent material used to form an image of an object by focusing rays of light
a projector, creating the image of the real world inside the camera at what is called the film or focal plane
a transparent medium (usually glass) bounded by two curved surfaces (generally either spherical, cylindrical, or plane surfaces)
a transparent object with at least one curved side that causes light to bend
a transparent refracting medium, bounded by one or two surfaces, one or both of which are usually curved
a way or I protest that it concentrates or does diveger beams of light
a wonderful invention that takes spread-out light coming from one source and focuses it all to one spot
Allows light to pass through it rather then reflect on it like a mirror.
The structure within the eye that focuses light onto the retina (back of the eye).
A piece or pieces of glass that concentrates and directs light to a CCD or film to create an image.
A clear structure in the eye which focuses light on the retina, in the same way the lens of a camera focuses light on film.
Structure inside the eye that help to bring rays of light to a focus on the retina. Also known as the human crystalline lens.
A transparent or semi-transparent element which controls the distribution of light by redirecting individual rays. Luminaires often have lenses in addition to reflectors.
is an optical device made of glass or plastic that forms images by bending and focusing rays of light.
The part of the eye that focuses light on the retina. Made of water and protein.
Several planes of glass, or â€œlenses,â€ which can be focused onto a focal plane (on which sits a frame of celluloid film or a CCD) to create an image.
a transparent structure that focuses light rays which pass through it. The human lens is located behind the iris and combines with the cornea to provide the focusing power for the eye. See focusing power, cornea.
A medium which will bend light. The eye has its own crystalline lens that helps focus light. Spectacle lenses help bend the light in such a way that once it reaches the eye it can then be focused. Contact lenses do the same except that they are in contact with the eyeball.
Specialised optical glass or similar material that is designed to collect and focus light to produce a clear image on film, paper or on a projection screen.
A system of curved glass surfaces used to form an image by focusing rays of light. Some types of lenses are: Telephoto lenses: a lens of a relatively long focal length which magnifies the image and flattens perspective so that distant subjects can be photographed. For a 35mm camera a telephoto lens is 100mm or more in focal length. Standard lens: a lens which retains a perspective and image size closest to the human eye. For a 35mm camera a standard lens is 50mm in focal length. Wide angle lens: a lens of relatively short focal length which decreases image size, enhances perspective and creates wide depth of field. For a 35mm camera a standard lens is 35mm or less in focal length. Zoom lens: a lens of variable focal length which can be easily adjusted.
A clear structure inside the eye that is responsible for bending light to a pinpoint foucs on the retina. A cataract occurs when the clear lens becomes cloudy due to aging changes.
Usually a series of separate glass lenses, the lens on a camera is what focuses light onto the focal plane to create an image.
the almond-shaped, elastic structure within the eye that focuses images onto the retina. It is curved on both its front and back surfaces; the lens narrows or thickens to focus on images at different distances.
Natural crystalline lens of the eye. Transparent, biconvex intraocular tissue that helps bring rays of light to focus on the retina. Suspended by fine ligaments (zonules) attached between ciliary processes.
An object that helps focus light. In the human eye, this organ contracts or relaxes to allow us to focus light from different distances.
The lens of the eye is a flexible unit that consists of layers of tissue enclosed in a tough capsule. It is suspended from the ciliary muscles by the zonule fibers. ... more about the Lens
A double convex, clear structure of the eye that is located behind the iris and in front of the vitreous humor. It serves to refract light rays entering the eye to help form a focused image on the retina.
This transparent composition focuses light rays which pass through it. The lens sits behind the iris and provides approximately 35% of the focusing capacity. (The rest of the focusing ability is provided by the cornea.)
The transparent, double-convex portion of the eye that further focuses light from the cornea onto the retina.
The focusing part of the eye, which allows you to see from varying distances.
A glass or plastic shield that covers the bottom of a luminaire to control the direction and brightness of the light it emits.
The natural lens of the eye is designed to fine-focus light on the retina. It varies its shape for focusing on far or near objects.
A lens is a tube that holds elements of optical glass in place. A lens is designed to focus light on one common point in order to later produce an image on a light-sensitive material.
The part of the eye behind the iris that adjusts focus for different distances by changing shape
a transparent disk with curved surfaces used focus light
a curved piece of glass that brings light to a focus
A piece of transparent material which is used in an optical instrument for forming an image by focusing rays of light.
Transparent structure in the eye that focuses the image on the retina.
The clear structure near the front of the eye that focuses images onto the retina. It has the same shape and function as the lens within a camera.
the transparent structure inside the eye that focuses light rays onto the retina.
A structure inside the eye that helps to focus light on the retina. It is curved on both sides and acts similar to a camera lens.
A transparent optical component consisting of one or more pieces of optical glass with surfaces so curved (usually Spherical), that they serve to converge or diverge the transmitted rays of an object, thus forming a real or virtual image of that object.
A transparent biconvex disk consisting of a firm but elastic jelly type material. Works with the cornea to focus light onto the retina. The lens changes thickness depending on whether the eye is looking at an object up close or an object in the distance.
one or more pieces of optical glass or similar material designed to collect and focus rays of light to form a sharp image on the film or digital camera sensor.
rhymes with hens): part of a camera (or an eye) that focuses light
A thin, transparent structure behind the iris and the pupil that focuses light rays onto the retina.
The crystalline lens finishes the focusing of light. It helps to "fine tune" vision, and it is able to change shape to allow the eye to focus on near objects. When it becomes cloudy, it is called a cataract. Unlike the cornea, the lens can be made to change its shape (and, therefore, its refractive power) rapidly and voluntarily. Using its ability to change shape, the lens allows the eye to change its focal point. Changes in the shape of the lens will allow a normal eye to focus on near objects.
is a part of the eye that provides some focusing power. The lens is able to change shape allowing the eye to focus at different distances.
A structure made of transparent glass or other material, with at least one curved surface, which causes the light rays passing through it to converge or diverge in a controlled fashion.
An optical device for focusing a desired scene onto the imaging device in a CCTV camera.
The lens is the clear structure located behind the pupil. Its primary function is to provide fine-tuning for focusing and reading, which it accomplishes by altering its shape. Lensectomy Surgical removal of the lens, usually done by puncture incision through the ciliary disk during vitrectomy. Normally, the natural lens is removed only when it has become cloudy enough to obstruct vision, for example, when a cataract has formed in our latter years of life. The lensectomy procedure, however, can also be used to correct very high amounts of short-sightedness or long-sightedness.
A glass or plastic element used in luminaires to refract, that is, to control, the distribution of light. Lenses can be fiat and fitted into the aperture, or cup-shaped or spherical to fit over a lamp.
A transparent structure that focuses light rays which pass through it. There are two structures of the eye that focus light. The first is the cornea or front surface of the eye that provides about 65% of the focusing power of the eye. The human lens is located behind the iris and provides the remaining power for the eye. In younger patients (below about 45) the lens is able to adjust its power allowing the eye to change its focal length from distance to near. As we age the lens becomes increasingly stiff and looses its ability to adjust from distance to near.
transparent material (usually glass) with one or both sides curved, used to concentrate or disperse rays of light, and focus them on a distant object.
A device that bends light waves.
used to transmit light
Responsible for bringing rays of light into focus on the retina. It is a clear oval structure suspended behind the iris which can contract and expand as needed to provide additional focusing power.
transparent structure suspended in the eyeball between the aqueous and vitreous, furnishing the additional focusing power needed to bring light rays to a focus on the retina
A piece of glass or other transparent material used to converge or diverge transmitted light and form optical images.
A clear structure behind the pupil which helps to focus light onto the retina.
one or more pieces of curved glass or optical plastic arranged to bend light coming into the camera and form an image.
A transparent medium bounded by two geometrically describable surfaces one of which shall be curved - that is, spherical, cylindrical, toroidal or aspheric.
An optical device designed to produce an image on a screen, on a camera film, and in a variety of optical instruments. Also used to converge, diverge or otherwise control light rays in applications not involving images.
One part of an insect's eye which focuses light
This is a copier part. It is a piece of transparent material (glass) used in forming an image and focusing light rays.
A transparent optical component that converges light rays to form a two dimensional image of that object.
The opening in the front of a camera that allows light to enter. The amount of light that is allowed to enter is controlled by the iris. Lenses are also used to focus light from a lighting instrument and to project images.
A structure inside the eye that helps to focus light on to the back of the eye.
The crystalline lens of the eye which lies behind the cornea and iris, and is used to focus the light onto the retina permitting vision.
the transparent, double convex (outward curve on both sides) structure behind the iris. Lenses help to focus light rays into the retina
The transparent, double convex (outward curve on both sides) structure suspended between the aqueous and vitreous; helps to focus light on the retina.
a transparent device, found in the eye and in most cameras, used to form an image by focusing rays of light
It is an oval transparent structure at the front of the eye which focuses light rays to form a sharp image on the retina.
Optical element, usually made of glass which are capable of bending light. They may have single or multiple componants. Lens come in various sizes such as; wide, standard, telephoto, zoom etc.
A lens is anything which bends light. Lenses can either diverge or converge light waves.
Transparent tissue that focuses light rays on the retina. Also known as the inner crystalline lens. The shape of the cornea determines how light passes through the inner lens, and thus determines how light is focused on the retina.
Housed behind the iris, the lens is the second component that focuses light rays. Light rays that pass through the lens travel through the vitreous onto the retina. When the lens becomes clouded, it is called a cataract. Surgery for cataracts involves removing this clouded lens and, usually, replacing it with a man-made one.
transparent double convex-shaped (outward curve on both sides) structure suspended between the posterior chamber and vitreous body
In a light microscope, a piece of transparent material with one or more curved surfaces. The lens is used to alter the direction of light waves, typically to increase magnification or to sharpen resolution. In an electron microscope, a similar effect is achieved with a beam of electrons by using a magnetic (or electrostatic) field.
A piece or combination of pieces of glass or other transparent material that enables images to form by refraction of light.
A piece of glass or transparent material with two curved surfaces, or one plane and one curved, regularly bringing together or spreading rays of light passing through it, to provide focus or magnification.
A optical device 1) either made of a solid shaped piece of transparent material that is capable of gathering light rays (photons) reflect them from a subject and focus them on a viewing plane or 2) a electromagnetic lens that can focus electrons in a similar fashion on to a viewing plane. MPEG This stands for Motion Picture Experts Group. It is also a format used to make, view, and transfer both digital audio and digital video files.
One or more pieces of optical glass or similar material designed to collect and focus rays of light to form a sharp image on the film, paper, or projection screen. Close Window
A transparent piece of material, usually glass or plastic, with curved surfaces which either converge or diverge light rays. Often used in groups for light control and focusing.
A piece of glass used to protect a light bulb from dust or to redirect light.
a piece (or pieces arranged in a sequence) of glass that directs light reflected from the subject to the film plane
A curved piece of glass for bringing together or spreading rays of light passing through it.
A transparent or translucent medium that alters the directional characteristics of light passing through it. Usually made of glass or acrylic.
The laser beam focusing device. Lenses are specially made to best focus the beam of light for engraving purposes. Lenses need to be kept clean and periodically replaced.
One or more pieces of glass, specially shaped, arranged to bring together rays of light so they can be recorded on film or paper.
One or more pieces of optical glass or similar material designed to collect and transfer rays of light to form a sharp image on film, paper or a projection screen. In practical photography, compound lenses made of a number of elements of different types of glass are used. This enables the manufacturer to correct most of the faults (aberrations) found in simple lenses and provide images that are sharp across the whole picture.
The nearly spherical body in the eye that focuses light rays onto the retina.
The transparent structure in the front of the eye. With outward curves on both sides, the lens helps focus light on the retina. A piece of glass or other transparent material having two polished opposite surfaces, at least one of which is curved. Go to Top | Close Window
One or more pieces of optical glass used to gather and focus light rays to form an image.
the powerful focusing portion of the eye that acts like the lens in a camera.
The part of the eye between the iris and the vitreous humor, which helps to focus light rays entering the pupil on the retina.
1. A piece of glass that refract light; 2. A transparent part of the eye that focuses an image on the retina.3. A piece of transparent material with curved surfaces that bends or refracts light.
the transparent structure behind the pupil that focuses light onto the retina. (157)
Varies its refractive ability, accommodation, in order to focus an object on the retina.
the transparent, double convex (outward curve on both sides), structure which serves to focus light onto back of eye ( retina). Normally enclosed within connective tissue eye capsule and held in position by suspensory ligaments. By altering its shape the lens can focus near and far objects.
A component that converges or diverges an incident wavefront.
The glass opening at the front of the camera through which light passes.
Transparent lens-shaped body located behind the iris and controlled by the ciliary muscle. The lens can be focussed on nearby objects when the muscle contractions to thicken the lens and on far-off objects when the muscle stretches the lens making it thinner. ( crystallin, n.m)
The element of the eye that finely focuses the light into an image
Also known as the crystal, the lens is often made up of plastic, glass, or mineral glass (a harder glass composite that is resistant to scratching and breaking)
The lens of the eye is like an adjustable lens of a camera and focuses light rays on to the retina for sharp images. A condition called presbyopia occurs when the lens is no longer able to adjust for objects at different distances.
A piece of glass with one or both sides curved for concentrating or dispersing light beams.
An optical device that focuses light rays. In cameras, the lens is the device on the front face (or in a tube extending from the front face) that gathers the incoming light and concentrates it so that it can be directed toward the film (in an optical camera) or the imaging device (in a digital camera).
Transparent pieces of optical glass with curved surfaces that transmit light and cause it to converge or diverge into real or virtual images.
A optical device made of glass or other transparent material that forms images by bending and focusing rays of light. A lens made of a single piece of glass cannot produce very sharp or exact images, so camera lenses are made up of a number of glass "elements" that cancel out each other's weakness and work together to give a sharp true image. The size, curvature and positioning of the elements determine the focal length and angle of view of a lens.
Located behind the iris, this helps light focus onto the retina.
The part of the eye that serves to focus incoming light on a specific area on the retina.
A lens is a device that causes light to either converge and concentrate or to diverge, usually formed from a piece of shaped glass. Lenses may be combined to form more complex optical systems as a Normal lens or a Telephoto lens.
A curved piece of glass designed to bringlight rays to a focus.
Also called the crystalline lens. The transparent part of the eye located behind the iris that helps to focus light into images on the retina.
A true â€œlensâ€ is a single piece of glass (or other transparent substance) having one or more curved surfaces used in changing the convergence of light rays. What we commonly call a photographic lens is more accurately and technically called an â€œobjective,â€ an optical device containing a combination of lenses that receive light rays from an object and form an image on the focal plane.
The part of the eye immediately behind the iris that performs delicate focusing of light rays upon the retina. In persons under 40, the lens is soft and pliable, allowing for fine focusing from a wide variety of distances. For individuals over 40, the lens begins to become less pliable, making focusing upon objects near to the eye more difficult. This is known as presbyopia.
the transparent disc in the middle of the eye behind the pupil that brings rays of light into focus on the retina.
Any transparent body having two opposite surfaces polished, at least one of which is curved.
That basic item of equipment for capturing images
An optical component constructed of transparent substance with one or two curved surfaces of different curvature which has the ability to change the direction of beam travel. Infrared lenses are used for focusing the detector at a distance of interest and for modifying the size and distance of the focused field of interest.
The lens of the camera determines the angle of view and the focus of the captured image. There are many different lens options.
The clear structure in the eye that focuses light rays on the retina.
a transparent optical element, so constructed that it serves to change the degree of convergence or divergence of the transmitted rays.
1. A curved glass used to bring together or spread rays of light. 2. The transparent organ lying behind the iris and pupil that focuses light on the retina of the eye.
The part of the eye that helps focus light rays on a single point of the retina. See also cornea, pupil, retina.
An optical device of one or more elements in an illuminating or image forming system such as the objective of a camera or projector.
The optical component of a sensor that collimates or focuses light rays onto a receiver optoelement (photoelectric sensing) or an imager chip (vision sensing).
Used in luminaires to redirect light into useful zones.
The lens is similar to the lens in a camera. It provides the focusing ability of the eye. At the age of 40-45, presbyopia presents; this is when the lens begins to lose its focusing ability and a bifocal may be required. When the lens becomes opacified or cloudy, it is termed a cataract. The vision with a cataract can be simulated by trying to view through a stained glass window. A cataract can be removed and replaced with an artificial lens implant.
A carefully shaped piece of glas that is used in telescopes to bend rays of light in order to bring them to a focus and to magnify images. Simple lenses will focus different colours at different points, leading to a defect called chromatic aberration. The construction of good quality lenses requires the use of different types of glass, glued together. .
A cylinder of shaped pieces of glass or plastic at the front of a camera, the lens projects a tiny image of the subject onto the film.
The lens or crystalline lens is a transparent, biconvex structure in the eye that, along with the cornea, helps to refract light to focus on the retina. Its function is thus similar to a man-made optical lens.