Farsightedness, or hyperopia, is the condition in which distant objects are seen clearly, but nearby objects appear blurry. It occurs when the eyeball is shorter than normal (see Figure below ). This causes images to be focused in a spot that would fall behind the retina (if light could pass through the retina). Hyperopia can be corrected with convex lenses. The lenses focus images farther forward in the eye, so they fall on the retina instead of behind it.
Mark found that he often needed to hold a book or menu at arms length to see it. He was beginning to feel silly holding his arms out every time he wanted to read something so he decided to go to the eye doctor and get glasses.
Are images being focused infront of or behind his retina?