Definitions for "Trifocal Lens"
A lens that has three powers: one for correcting distance vision, one for correcting intermediate sight, and one for correcting near vision.
Multifocals with lines that provide three fields of vision (Near vision, Distance Vision and Intermediate Vision)
A lens having three areas of viewing, each with its own focusing power. Usually, the upper power is used for distance vision, the lower power for close vision such as reading, and the middle area for "arms length" vision. Go to Top