It occurs when the eyeball is too long or the cornea is too curved, causing light to focus in front of the retina. Those who have this condition may suffer from symptoms such as eyestrain ...

Cornea Tough, transparent covering over the front part of the eye. Convex in shape. Refracts light as it enters the eye (by a fixed amount). Iris Coloured part of the eye that contains muscles.

the lens being too thick and curved - so that light is focused in ... laser surgery to change the shape of the cornea and a replacement lens in the eye. Contact lenses work by being in ‘contact ...