the eye
astigmatism
myopia
hyperopia
presbyopia

Hyperopia occurs when the eyeball is too short. The reduced length means the point of focus lies beyond the back wall of the eye, and light rays are not yet in focus when they arrive at the retina. The result is a blurred image. Improper corneal curvature can also cause hyperopia. If the cornea is too flat, not enough refraction of light rays from near objects takes place to bring them into focus on the retina. Normally, all young children have a small degree of hyperopia that decreases as they progress through their teens. Despite their hyperopia, most youngsters can see well at all distances because the accommodation provided by the crystalline lens is enough to counteract minor refractive errors.

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