You are designing eyeglasses for someone whose near point is 60 cm. What focal length lens should you prescribe so that an object can be clearly seen when placed at 25 cm in front of the eye?
a. 18 cm
b. 18 cm
c. 43 cm
d. 60 cm
e. 43 cm
[Ques. 2] The normal eye has a near point of 25 cm. If a given individual's near point is 73 cm, for what problem will the eye doctor prescribe correction?
a. myopia
b. presbyopia
c. hyperopia
d. astigmatism
e. color blindness
[Ques. 3] Two thin lenses in combination are placed in contact with each other along a common axis. They have powers of 70 and 20 diopters, respectively. What is their combined power?
a. 25 diopters
b. 50 diopters
c. 90 diopters
d. 25 diopters
e. 70 diopters
[Ques. 4] A lens with a focal length of 20 cm has what power?
a. 5.0 diopters
b. 0.2 diopters
c. 2 diopters
d. 5.0 diopters
e. 0.02 diopters
[Ques. 5] Which eye defect is corrected by a lens having different curvatures in two perpendicular directions?
a. myopia
b. presbyopia
c. hyperopia
d. astigmatism
[Ques. 6] Which term identifies the defect where the lens produces a line image of a point source?
a. myopia
b. presbyopia
c. hyperopia
d. astigmatism
[Ques. 7] Which term below identifies the eye defect characterized by an inability to see distant objects clearly?
a. myopia
b. presbyopia
c. hyperopia
d. astigmatism
[Ques. 8] A diverging lens will be prescribed by the eye doctor to correct which of the following?
a. myopia
b. presbyopia
c. hyperopia
d. astigmatism
[Ques. 9] The pupil of the eye increases in size under which condition?
a. eye is focused on a distant object
b. eye is focused on a nearby object
c. object viewed is dimly illuminated
d. object viewed is well illuminated
[Ques. 10] The ciliary muscle of the eye is relaxed under which condition?
a. eye is focused on a distant object
b. eye is focused on a nearby object
c. subject being viewed is well illuminated
d. subject being viewed is dimly illuminated
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