myopia (short sight) Abnormality of the eye in which it cannot focus on distant objects, because refraction is too great or the eyeball is too long, so that the image is focused in front of the retina. A normal eye focuses parallel beams precisely on the retina; close objects can be brought into focus by increasing the refractive power of the lens (accommodation). Myopia is corrected by negative lenses in spectacles or contact lenses. The condition usually occurs during school years and is evident from the fact that the child cannot read what is on the blackboard; he or she may also complain of headache. The condition does not usually degenerate after the age of twenty. A myopic for whom spectacles are prescribed should persist in wearing them, increasing the eye’s