Question:
Does short-sightedness (myopia) or long-sightedness (hypermetropia) imply necessarily that the eye has partially lost its ability of accommodation? If not, what might cause these defects of vision?
Answer:
No, myopia nad hypermeteropia does not at all imply that the eye has lost its ability of accomodation. Myopia is a condition where the eye balls gets elongated in the front-back direction, whereas hypermeteropia is a condition where eye balls are shortened.
When the eye loses its ability of accomodation, the condition is called presbyopia.
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