Question

List two causes of this defect.

Hint:

For correcting hypermetropia, convex lenses are used, and their power is calculated as \( P = \frac{1}{f} \). A positive power indicates the use of convex lenses.

Answer 1

Two common causes of hypermetropia are:
1. ₂Shortened eyeball₂: The eye's length from the cornea to the retina is too short, which prevents the image from being focused on the retina.
2. ₂Weak curvature of the cornea or lens₂: If the cornea or lens is too flat, it cannot bend light rays sufficiently to bring them to focus on the retina.