Question

A student is unable to see clearly the words written on the black board placed ata distance of approximately 3 m from him. Name the defect of vision the boy issuffering from. State the possible causes of this defect and explain the methodof correcting it

Answer 1

Answer

Defect of vision: Myopia or shortsightedness or near nearsightedness

Causes of myopia:

Excessive curvature of eye lens; eye lens becomes more converging

1.Elongation of eye ball

2.Methods of correction:

By the use of concave lens of suitable power or focal length the defect is corrected.