Why do progressive lenses with distance corrections that lie near “plano” often present severe adaptation issues for patients?
The initial impressions of “swim” heard from first-time progressive lens wearers or the negative comments from patients who have experienced abrupt base curve changes, are best understood if we look at how nature evolved the light receptors known as rods in the periphery of our retinas. Quick recognition of the movement of even a single blade of grass in our peripheral vision could often spell the difference between hunger and evading the stalk of a predator. Unlike the cones, nature chose to maximize the speed of peripheral recognition by ensuring the fastest neural processing available: each of our rods is individually wired directly to a corresponding single neuron in our brain.
Related Questions
- Why do progressive lenses with distance corrections that lie near "plano" often present severe adaptation issues for patients?
- Are glass lenses with a greater "base curve" likely to give sharper vision when I look through my glasses near the edges?
- CAN I CONVERT MY BIFOCAL, TRIFOCAL, OR PROGRESSIVE(NO LINE) LENSES TO A SIMPLE READING OR A SIMPLE DISTANCE ONLY LENS?
