Question

To restore clear vision in persons whose size of the eyeball has reduced, he/she is suggested to use suitable

• A. Converging lens
• B. Diverging lens
• C. Bifocal lens
• D. Cylindrical lens

Hint:

Hypermetropia → Use convex (converging) lens.

Answer 1

The Correct Option is A

To restore clear vision in individuals whose size of the eyeball has reduced, resulting in the inability to focus properly, a suitable lens must be used. This condition relates to a common refractive error known as farsightedness or hyperopia. Here's a step-by-step explanation:

1. Understanding Hyperopia: In hyperopia, the reduced size of the eyeball causes light rays entering the eye to focus behind the retina instead of directly on it. This leads to blurred vision when looking at nearby objects.
2. Role of Lenses in Correction: The correction for this type of refractive error involves using lenses that can help in converging light rays before they enter the eye.
3. Converging Lens: A converging lens, or a convex lens, is suitable for hyperopia as it converges the light rays before they enter the eye, allowing them to focus directly on the retina. The focal point of the lens aids in adjusting the focal length so that clarity is attained.
4. Other Options:
   • Diverging Lens: This is used to correct myopia (nearsightedness) where the eyeball is elongated, making it unsuitable for hyperopia.
   • Bifocal Lens: Often used for presbyopia, a condition associated with aging eyes, where both near and far vision correction is needed.
   • Cylindrical Lens: Specifically used for correcting astigmatism, a condition where the eye does not focus light evenly on the retina.

Therefore, the suitable choice for correcting vision in cases where the eyeball size has reduced is a Converging lens.