Trifocal Lenses
Trifocal Lenses What are trifocal lenses? In 1827, John Isaac Hawkins patented the Trifocal eyeglasses that have three different regions that correct for the following: distance, intermediate (arm's length), and near vision. People with advanced presbyopia who have been prescribed 2 diopters or more for reading, will typically be prescribed trifocals. Trifocals are [...]
