I went to a doctor for my eye checkup. And I couldn’t read the last line at all. Doctor said this is the limit to your eye and no matter how strong a lens, you would never be able to read the last line

Question

But I don’t get it. Why would if I put a stronger lens, I wouldn’t be able to read the last line? She said you must have never been able to read the last line in your life, and she was correct, but I don’t understand the science at play here

In: 58

Answer 1

It’s possible to have better than 20/20 vision, but that’s a “feature” of the eye, not something glasses can produce. The color-receptors (cones) on the retina are relatively large. There are lots of them in the focal spot of the lens, so while it’s the clearest picture it’s also a bit more “pixelated” than if the spot where just rods that react to light in general and can be more tightly packed.

Colorblindnesses can be due to a total lack of cones, and instead there are more rods in the focal spot. Tadaaah, better resolution, but worse color vision, and usually more sensitive to or easily blinded by light.