Ophthalmologists have been searching for effective ways to address presbyopia for many decades, particularly with cataract surgery.
We started off doing monovision with one eye set for distance vision and the other for near or intermediate vision by targeting myopia. This works but comes at a compromise of reduced depth perception, so there was a push to multifocal IOL designs. These were originally refractive in design, which worked, but produced many unwanted visual side effects. The next evolution was diffractive designs and eventually trifocal optics, which give better vision but (Read more...)