Chromatic Aberration

Revision as of 19:47, 17 July 2020 by Dlskidmore (talk | contribs) (→‎Duochrome test: I think there is signs confusion here. Need to re-work the wording that is not backwards when signs are considered.)
Jump to navigation Jump to search

Chromatic aberration is probably most easily understood as a prism effect. When light shines through a prism, you see that different colors of light bend (undergo Refraction) differently and create a rainbow effect. When light shines through any lens, including glasses and the natural lens of your eye, the same occurs to a lesser degree. The effect of this is that the Focal Length of the lens is not exactly the same for all colors of light.

Chromatic aberration lens diagram

Duochrome test

KH HK
EPO OPE

The chromatic aberration expected during a normal eye exam is about a half diopter difference between red and green. This can be a handy test to dial in a final prescription by looking at text on red and green backgrounds and seeing which is clearer.

External Sources

References