MCQ
Human eye and optical defects MCQ - Practice Questions with Answers
Solve 3 Human eye and optical defects questions for RAS/RPSC preparation.
Practice questions
Q1The least distance of distinct vision, or the near point, for a normal eye is taken as 25 cm. This distance increases to 50 cm for an elderly person. If the person tries to read a book at about 25 cm from the eye, the image appears blurred. This defect of vision of the eye is called:
Presbyopia is the age-related loss of the eye's power of accommodation, so the near point moves farther away and close objects become blurred. That is exactly described when the near point increases from 25 cm to 50 cm in an elderly person. Hypermetropia also causes difficulty in seeing nearby objects, but the age-linked weakening of accommodation points specifically to presbyopia. Myopia affects distant vision, not near reading. Astigmatism is caused by unequal curvature of the cornea or lens and produces distorted vision, not this near-point shift.
Q2If light from a distant object, after refraction by the eye lens, converges at a point in front of the retina, this type of eye defect is called:
In myopia, parallel rays from a distant object are focused before they reach the retina, so distant objects appear blurred while nearby objects are seen more clearly. Hypermetropia is the opposite case, where the image tends to form behind the retina and near vision is affected. Presbyopia is an age-related loss of accommodation, usually due to reduced lens flexibility. Astigmatism occurs when unequal curvature of the cornea or lens causes distorted focusing in different meridians. The given condition directly describes myopia.
Q3A bifocal lens is used to correct the defect of: Choose the most appropriate option from below.
A bifocal lens has two optical powers in the same lens, usually one part for distant vision and another for near vision. This arrangement is used for presbyopia, an age-related condition in which the eye gradually loses its ability to focus on nearby objects. Myopia needs a concave lens for distant objects, while hypermetropia is corrected with a convex lens for near vision. Cataract is clouding of the eye lens and is treated medically or surgically, not corrected by a bifocal lens as the primary remedy.
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