Optometrists exam questions2022

Question:1

Contrast sensitivity:

a. measures the eye’s sensitivity to light

b. is inversely proportional to contrast of image

c. can be measured with Snellen's chart

d. can be measured with VISTECH

e. may be reduced following LASIK

 Answers:

b. is inversely proportional to contrast of image

d. can be measured with VISTECH

e. may be reduced following LASIK

 

Question:2

The following are true about birefringence:

a. they have two refractive indices

b. they split a unpolarized light into two polarized lights

c. polarimetry uses the birefringence of the nerve fibre

    layer to quantitate its thickness indirectly

d. it is used in pleoptics to produce Haidinger's brushes

 Answers:

a. they have two refractive indices

b. they split a unpolarized light into two polarized lights

c. polarimetry uses the birefringence of the nerve fibre

    layer to quantitate its thickness indirectly

 

Question:3

In stereoscopic vision testing:

a. corresponding retinal areas in both eyes are stimulated

b. the grading is based on the least horizontal disparity of

     retinal image that evokes depth perception

c. in normal person, the value is about 60 seconds of arc or

    better

d. amblyopia is unlikely if the stereoacuity is better than

     250 seconds of arc

 Answers:

b. the grading is based on the least horizontal disparity of

     retinal image that evokes depth perception

c. in normal person, the value is about 60 seconds of arc or

    better

d. amblyopia is unlikely if the stereoacuity is better than

     250 seconds of arc

 

Question:4

The following refers to the amount of light arriving at a given point:

a. illuminance

b. brightness

c. Shininess

d. irradiance

e. radiance

 Answers:

a. illuminance

d. irradiance

 

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Question:5

Regarding reflection:

a. it always occurs when light travels from one

    medium into another

b. the incident ray and the reflected lie in the same

     plane

d. diffuse reflection occurs when light is reflected

     from a regular surface

 Answers:

a. it always occurs when light travels from one medium into

    another

b. the incident ray and the reflected lie in the same plane

 

Question:6

The image of an object formed by reflection at a plane surface has the following properties:

a. the image is upright

b. the image is laterally inverted

c. the image is real

d. it is located along a line perpendicular to the reflecting

     surface

 Answers:

a. the image is upright

b. the image is laterally inverted

d. it is located along a line perpendicular to the reflecting

     surface

 

Question:7

The following are true about reflection on a mirror:

a. the focal length of a concave mirror is half the length of

    its radius of curvature

b. the focal length of a convex mirror is half the length of

     the its radius of curvature

 

c. the image formed by a concave mirror is always

    magnified

 Answers:

a. the focal length of a concave mirror is half the length of

     its radius of curvature

b. the focal length of a convex mirror is half the length of

    the its radius of curvature

 

Question:8

For an object situated between the centre of curvature and the principal focus of a concave mirror, the image has the following characteristics:

a. it is erect

b. it is virtual

c. it is real

d. it is magnified

e. the image is found within the centre of curvature

 Answers:

c. it is real

d. it is magnified

 

Question:9

For an object situated outside the centre of curvature of a concave mirror, the image has the following characteristics:

a. it is erect

b. it is virtual

c. it is real

d. it is magnified

e. the image is found within the centre of curvature

 Answers:

c. it is real

e. the image is found within the centre of curvature

 

Question:10

For an object situated within the principal focus of a concave mirror, the image has the following characteristics:

a. it is erect

b. it is laterally inverted

c. it is real

d. it is magnified

e. the image is found within the centre of curvature

 Answers:

a. it is erect

b. it is laterally inverted

d. it is magnified

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