Does short-sightedness (myopia) or long-sightedness (hyper - metropia) imply necessarily that the eye has partially lost its ability of accommodation? If not, what might cause these defects of vision?
Given:
When the eye-lens loses its ability of accommodation, the defect is called presbyopia. In some cases, the eye-lens is normally accommodated by a person undergoing through myopia or hypermetropia. When the eye-balls get elongated from front to back then it is myopia. Hypermetropia, on the other hand occurs when the eye-balls get shortened.