Tag Archives: optics

Aniseikonia, the serious vision problem nobody seems to know about

I’ve had dry eye for a few years and have posted quite a bit about my problems focussing on images on a computer screen for hours on end.  What I didn’t know is that there is a scientifically accepted reason why some patients can’t adjust properly to glasses but can see significantly better with contact lenses.

The condition is known as Aniseikonia.

“Aniseikonia is an ocular condition where there is a significant difference in the perceived size of images. It can occur as an overall difference between the two eyes, or as a difference in a particular meridian “

There are 2 kinds of aniseikonia, static and dynamic. Static is observable when we focus on an object while dynamic is observed when we try to move our eyes to focus on a moving object or parse text, for instance. See here for more information and some explanatory graphics. Continue reading