1. Short-Sightedness (Myopia):

Problem: Difficulty seeing distant objects clearly.

Causes: Eyeball is too long or the lens is too strong (excessively curved).

Result: Light focuses in front of the retina instead of directly on it.

Correction: Concave lenses (diverging lenses) spread the light rays so they focus correctly on the retina.


2. Long-Sightedness (Hyperopia):

Problem: Difficulty seeing nearby objects clearly.

Causes: Eyeball is too short or the lens is too weak (too flat).

Result: Light focuses behind the retina.

Correction: Convex lenses (converging lenses) bend light inward so it focuses correctly onhttps://t.me/ethiobiology2017
https://t.me/ethiobiology2017