Refers to a condition in an individual of the inability to see, or the loss of normal or correctable vision. This is usually due to damage or disorders of the eyes, or of the area of the brain that is responsible for vision.
being without sight; or, having a maximal visual acuity after correction by refractive lenses, of one-tenth normal vision or less (20/200 or less on the Snellen test). !-- google_ad_client = "pub-2371764724899146"; google_alternate_ad_url = "http://www.themcfox.com/multiple-sclerosis/ms-drugs/glossary/alternate1-250_250.htm"; google_ad_width = 250; google_ad_height = 250; google_ad_format = "250x250_as"; google_ad_channel =""; google_color_border = "FFFFFF"; google_color_bg = "FFFFFF"; google_color_link = "0000FF"; google_color_url = "9999AA"; google_color_text = "000080";
transient or permanent inability to see with one or both eyes
visual impairment. The historic name for many forms of visual impairment, it is now regarded as unhelpful because it suggests there is one condition rather than a spectrum of possible visual impairments.
Blindness includes a variety of conditions involving extreme (but not complete) or complete loss of vision.
Inability to see; absence or severe reduction of vision.
Loss of vision. Legally, visual acuity less than 20/200 with glasses.
lack or loss of ability to see
There are over 50 definitions of blindness worldwide. The World Health Organisation definition of blindness is less than 3/60 in the better seeing eye. This means that the better seeing eye cannot read the top letter on the Snellen visual acuity chart at three metres.
A loss of sight which is either hereditary or acquired.
you can't see until the potion wears off 850 turns later. If it's any consolation, you can't be transfixed by Floating Eyes or confused by Umber Hulks.
(Legal Definition): corrected visual acuity of 20/200 or less, or a visual field diameter of no more than 20 degrees in the better eye
To the average household dog, blindness presents few problems. Especially if vision loss is gradual (as it is with senile cataracts or with progressive genetic conditions), dogs learn to negotiate their environment as if their vision was perfect. Owners can further ease their pet's acclimation to a world of reduced vision by taking advantage of a dog's other functional senses. Your speech should be frequent and exaggerated for the blind dog and the sense of smell can be very useful for 'tagging' specific areas of the home.
If your cat bumps into objects, his or her sight may be failing. Causes can include retinal disease, cataracts,glaucoma, a stroke, tumour or inherited neurological disease. Contact your vet promptly, as total or partial loss of sight may be reversed. Keep your cat indoors in familiar surroundings, and put a guard in front of fires.
A disability that affects a person's eyesight. Eighty percent of blind people have some vision. See also: legally blind and low vision.
Loss of useful sight. Blindness can be temporary or permanent. Damage to any portion of the eye, the optic nerve, or the area of the brain responsible for vision can lead to blindness. There are numerous (actually, innumerable) causes of blindness. The current politically correct terms for blindness include visually handicapped and visually challenged. See the entire definition of Blindness
complete inability to see
By definition, in the US, blindness is corrected visual acuity of 20/200 or less in the better eye, or a visual field of 20 degrees or less in the better eye.
Inability to see. Legal blindness is corrected visual acuity of 20/200 or less, or corrected visual field to 20 degrees or less, in the better seeing eye. See Low Vision in Eye Care Encyclopedia. See General Eye Care in Free Eye Tests.
Blindness is the condition of lacking visual perception due to physiological or psychological factors.