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HCS (Haryana)Prelims2022General Studies

Question

A person is not able to see distant objects clearly. Statement I: The person is suffering from Hypermetropia. Statement II: The defect may have been caused due to excessive curvature of the eye lens or elongation of the eye ball. Statement III: The defect can be corrected by using a concave lens of suitable power. Statement IV: The defect can be corrected by using a convex lens of suitable power. Which of the following combinations of above statements is correct?

Options

  1. A Statements - I and III
  2. B Statements - II and IV
  3. C Statements - I and IV
  4. D Statements - II and III
Show Answer

Correct Answer

D Statements - II and III

Model Answer

Hypermetropia (long-sightedness)

  • It is a defect of the eye due to which a person can see distant objects clearly but nearer objects are not clearly visible.
  • The image is formed behind the retina and the near point moves away.
  • Hypermetropia, also known as farsightedness, is a refractive error of the eye that makes it difficult to see nearby objects clearly. In hypermetropia, the eyeball may be shorter than normal or the curvature of the eye lens may be insufficient, causing light rays to focus behind the retina instead of on it.
  • Statement II correctly explains the possible causes of hypermetropia. The defect can occur due to excessive curvature of the eye lens or elongation of the eyeball.
  • Statement III is correct because hypermetropia can be corrected by using a concave lens of suitable power. A concave lens diverges light rays before they enter the eye, allowing the image to focus correctly on the retina.
  • Statement I is incorrect because hypermetropia refers to difficulty in seeing nearby objects clearly, not distant objects.
  • Statement IV is incorrect because a convex lens, which converges light rays, is used to correct near-sightedness (myopia), not hypermetropia.
  • Therefore, the correct combination is Statement II and Statement III.

Additional information

Defects of Vision

1. Myopia (short-sightedness)

  • The human eye can see a nearby object clearly but cannot see far away object clearly
  • Correction: Concave lens

2. Presbyopia

  • In this defect, both near and far objects are not clearly visible. It is an old age disease and it is due to the losing power of accommodation
  • Correction: Bifocal lens

3. Astigmatism

  • In this defect, the eye cannot see horizontal and vertical lines clearly, simultaneously. It is due to the imperfect spherical nature of the eye lens
  • Correction: Cylindrical lens

Syllabus topics

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2022 — A person is not able to see distant objects clearly… | Dr. Amit IAS Academy