Question

A person can see clearly objects between 15 and 100 cm from his eye. The range of his vision if he wears close fittings spectacles having a power of $0.8$ dipole is

• A. $5$ to $500cm$
• B. $12$ to $250cm$
• C. $17$ to $500cm$
• D. $17$ to $250cm$

Answer 1

Answer: (C)

$17$ to $500cm$

If he wears glass with power of-0.8 , then he would have residual -0.20D of myopia for distance and for near he would be able to see with the equivalent of -5.87D of myopia. This translates to range of clear vision with those glasses from 1/0.2=5 meters to 1/5.87=0.17 meters i.e. 17cm to 500cm.