Question

A person unable see object distinctly placed within 50cm from his eyes that defect

Answer 1

HYPERMETROPIA...his near point has gone far away...causes-
-)shortening of eye ball
-)elongation of focal legth due to thinning of crystalline eye lens

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Answer 2

The defect of this person’s eye is called Hypermetropia.

It is also commonly known as Long-sightedness. In this condition, nearby objects appear hazy or blurred but far-away objects appear clear and sharp. Reading, writing and desk-work becomes troublesome, causing headache or strain.

Hypermetropia can be remedied by using prescription eye-glasses or contact lenses or surgery.