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.

science technology

Pulse Width Modulation & Eyestrain

In my last post I mentioned problems with PWM-dimmed monitors as an aside but that’s not an accurate reflection of the negative effects I think PWM can have on some people.

Pulse Width Modulation dimming involves varying the frequency of the LED backlight pulse to give the impression that the monitor is less bright. TFT central explain the technique here

This Blog

Life & the meaning of it all…

The past 2 years of my life have been interesting to say the least. I’ve gone from being a respected (if my linkedin endorsements are anything to go by) IT researcher and software developer to being a full-time dispute mediator with the partnership I setup, ARC Mediation.

I’ve had so many questions from friends and family about my “new professional direction” and other euphemisms that I felt a “once and for all” explanation was in order. Why bother to explain myself? Well, I’ve yet to give a response to my friends that I’m happy with and I tend to shirk the issue.