eyeglasses with smallest chromatic abberation

mike1127

Ah, we are getting closer.

The curvature is different, yes (with different indices). That makes me wonder:

Well, let's consider a ray coming out of my pupil which intersects the inner surface of the lens. At the optical center that ray is perpendicular to the lens surface. Moving away from the center it's at an angle. I have always been aware that the effective power is higher away from the center. I have this trick .. as my eyes change, my prescription sometimes is too weak for a while (until I get new glasses).. so if I really need sharper vision for a brief period, I tilt my glasses. Presto -- higher power and crisp vision.

So does that angle of incidence to the inner lens surface affect color fringing negatively?

One thing that could be done is (1) going to 1.60 index plastic and (2) making the lens with a considerably higher base curve so the angle of incidence is closer to 90 degrees (lower power lenses are usually made with a high base curve because it's more attractive, but it increases the edge thickness so higher-power lenses are usually made with a small base curve)


Mike

Andy Resnick

Chromatic aberration depends only on the Abbe number.