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 12
A person can see distant objects clearly but not nearby objects. Which defect of vision does the person have?
A person complains of blurred vision when reading but can see distant objects clearly. Which lens should be prescribed?
A person has both myopia and hypermetropia. What type of lens is used to correct this condition?
A person with hypermetropia has a near point at 50 cm. What is the power of the lens required to correct this defect? (Assume the normal near point is 25 cm.)
A person with myopia has a far point of 2 m. What power of lens is required to correct the defect? (Assume the near point is normal at 25 cm.)
A person with myopia uses a lens of focal length -1.5 m. What is the power of the lens?
A person with presbyopia needs a lens of power +1.5 D for reading. What is the focal length of the lens?
Describe how bifocal lenses help in correcting presbyopia.
Explain the cause of hypermetropia and how it is corrected.
Explain why a person with astigmatism cannot see both horizontal and vertical lines clearly at the same time.
Explain why a person with myopia cannot see distant objects clearly.
Name the defect of vision in which the image of a distant object is formed in front of the retina.
State one main difference between myopia and hypermetropia.
State the normal range of vision for a healthy human eye.
Which part of the eye is mainly responsible for the defect of astigmatism?
