Page 1 - HA-defects of vision

Objective Questions:

• 1. A person cannot see distinctly objects kept beyond 2 m. This defect
can be corrected by using a lens of power
(a) +0.5 D
(b) -0.5 D
(c) +0.2 D
(d) -0.2 D

• The defect of vision in which a person cannot see the distant objects
clearly but can see nearby objects clearly is called
(a) myopia
(b) hypermetropia
(c) presbyopia
(d) bifocal eye

• The defect of the eye in which the eyeball becomes too long is
(a) myopia
(b) hypermetropia
(c) presbyopia
(d) cataract

• The defect of vision in which the image of nearby objects is formed
behind the retina, is
(a) myopia
(b) short-sightedness
(c) hypermetropia
(d) presbyopia

Subjective Questions:

ASSESSMENTS:

A person with a myopic eye cannot see objects beyond 1.2m distinctly. What
should be the nature of corrective lens to restore proper vision? (P= -0.83 Lens
– concave)

1. The near point of a hypermetropic eye is at 75 cm from the eye. What is the
power of the lens required to enable him to read clearly a book held at 25 cm
from the eye? (P= 2.66D)

2. A myopic person uses specs of power – 0.5D. What is the distance of far
point of his eye? (2m)

3. A person wants to read a book placed at 20 cm, whereas near point of his
eye is 30 cm. calculate the power of the lens required (1.67D).