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 11
A person can see nearby objects clearly but distant objects appear blurred. Which defect of vision does the person have?
Describe how a concave lens corrects myopia.
Describe how bifocal lenses help people with presbyopia.
Explain the main cause of hypermetropia.
A person with hypermetropia has a near point at 75 cm. What type of lens should be used to correct this defect? (1) Concave lens (2) Convex lens (3) Cylindrical lens (4) Plano-concave lens
A person’s near point is 50 cm. What is the power of the lens required to correct this defect? (Assume normal near point is 25 cm)
If a person’s far point is 2 m, what is the focal length of the lens required to correct their myopia?
A 60-year-old person finds it difficult to read a book at 25 cm and also cannot see distant objects clearly. Which combination of lenses would be most suitable for this person? (1) Single convex lens (2) Single concave lens (3) Bifocal lens with upper part concave and lower part convex (4) Cylindrical lens
A person with hypermetropia has a near point at 75 cm. What type of lens should be used to correct this defect? (1) Concave lens (2) Convex lens (3) Cylindrical lens (4) Plano-concave lens
Which of the following defects can be corrected by using cylindrical lenses? (1) Myopia (2) Hypermetropia (3) Astigmatism (4) Presbyopia
Which of the following is a symptom of astigmatism? (1) Blurred vision at all distances (2) Double vision (3) Distorted or blurred vision for lines in one direction (4) Complete loss of vision
Which of the following is NOT a cause of myopia? (1) Elongation of the eyeball (2) Increase in the focal length of the eye lens (3) Decrease in the focal length of the eye lens (4) Excessive curvature of the cornea
A person with both myopia and hypermetropia in the same eye is usually prescribed ________ lenses.
A person with presbyopia may need ________ lenses to see both nearby and distant objects clearly.
Astigmatism is usually corrected by using ________ lenses.
Myopia is also known as ________.
State whether the following statement is true or false: Astigmatism is caused by the irregular curvature of the cornea or lens.
True or False: Hypermetropia is corrected using a concave lens.
True or False: Myopia can be caused by excessive curvature of the cornea.
True or False: Presbyopia can be corrected by using only convex lenses.
