Defects of Vision
Physics ⇒ Light and Optics
Defects of Vision starts at 9 and continues till grade 12.
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See sample questions for grade 10
A person can see nearby objects clearly but distant objects appear blurred. Which defect of vision does the person have?
A person has both myopia and hypermetropia. Which type of lens is used to correct this condition?
A person’s near point is 50 cm instead of 25 cm. What type of lens is required to correct this defect?
A student reads a book at 40 cm from his eyes, but the letters appear blurred. His optician prescribes a lens of power +2.5 D. What type of defect does he have?
A person’s near point is 100 cm. What is the focal length of the lens required to correct his vision so that he can see clearly at 25 cm? (Give your answer in cm, rounded to one decimal place.)
A student reads a book at 40 cm from his eyes, but the letters appear blurred. His optician prescribes a lens of power +2.5 D. What type of defect does he have?
A person with hypermetropia has a near point at 75 cm. Calculate the power of the lens (in diopters) required to correct his vision so that he can see objects clearly at 25 cm. (Give your answer to one decimal place.)
A person with normal vision can see objects clearly from 25 cm to infinity. If a person can only see objects clearly between 40 cm and 2 m, identify the defects of vision present and explain how both can be corrected.
Which defect of vision is most commonly associated with aging? (1) Myopia (2) Hypermetropia (3) Presbyopia (4) Astigmatism
Which lens is used to correct myopia? (1) Convex lens (2) Concave lens (3) Cylindrical lens (4) Bifocal lens
Which of the following is NOT a cause of myopia? (1) Elongation of the eyeball (2) Shortening of the eyeball (3) Excessive curvature of the eye lens (4) Use of concave lens
Which of the following is NOT a defect of vision? (1) Myopia (2) Hypermetropia (3) Astigmatism (4) Cataract (5) Presbyopia
Fill in the blank: The defect of vision caused by the irregular curvature of the cornea or lens is called ________.
Fill in the blank: The defect of vision in which a person cannot distinguish between certain colors is called ________.
Hypermetropia is caused when the image is formed ________ the retina.
Myopia is also known as ________.
True or False: A person with myopia has a far point less than infinity.
True or False: Astigmatism can cause blurred vision at all distances.
True or False: Hypermetropia is corrected using a concave lens.
True or False: Presbyopia can be corrected using bifocal lenses.
