Question

Suggest the use of suitable lenses for the correction of each defect mentioned in the previous question.

Hint:

Bifocal lenses provide a convenient all-in-one solution for patients with both myopia and hypermetropia.

Answer 1

Step 1: Understanding the Concept:
Different optical defects require different types of corrective lenses based on whether light needs to be converged or diverged before entering the eye.

Step 2: Detailed Explanation:
To correct the near point defect (Hypermetropia), converging lenses are required.
Therefore, a convex lens is used to view nearby objects (like reading).
To correct the far point defect (Myopia), diverging lenses are required.
Therefore, a concave lens is used to view distant objects.
In practice, these are usually combined into a single pair of glasses called bifocals, where the upper part contains the concave lens and the lower part contains the convex lens.

Step 3: Final Answer:
Use a convex lens for near vision and a concave lens for distant vision.