Visual Disorders

Fred

Lilly

"Well, I think that can't be right.
Only if the eyeball is too long and the clear image is created in front of the retina, it then has to be shortsightedness.
If, however, the eyeball is too short, we do not have shortsightedness; we would then be farsighted and the clear image would be created behind the retina! But this isn't what you can see in the drawing, is it?"

Fehlsichtigkeit

"By the way, both shortsightedness and farsightedness can be compensated by lenses. If you add a frame to a pair of lenses you will get glasses and if you have lenses made of very thin plastic foil they are called contact lenses."

Now you surely have an idea how to solve the brain teaser's question from the beginning!