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An optometrist suggests lenses of power +0.6 D to a person suffering from an eye defect. Which defect is he suffering from and what is the nature of the lens specified?

An optometrist suggests lenses of power +0.6 D to a person suffering from an eye defect. Which defect is he suffering from and what is the nature of the lens specified? Correct Answer Hypermetropia, converging lens

The correct answer is option 1, i.e., Hypermetropia, converging lens.

  • The person is suffering from Hypermetropia and the nature of the lenses specified to him is converging.
  • The power is a positive number, which means lens used are convex (converging) lenses because P = 1/f (in m) and focal length for the convex lens is positive, while for the concave lens it is negative.
  • As we know, convex lenses are used in the case of Hypermetropia thus, we can easily make out that the eye defect the person is suffering from is Hypermetropia.
  • Hypermetropia:
    • Also known as far-sightedness.
    • An eye defect in which distant objects can be seen clearly but nearby objects can't be seen distinctly.
    • The near point is farther away from the normal near point (25 cm).
    • Image of the nearby object is formed behind the retina.
    • Causes - (a) focal length of the eye lens is too long, (b) eyeball has become too small.
    • Correction - convex lens of suitable power.

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