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

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Solution

The correct option is **B** 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.

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.

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