Question
Distinguish between : near-sightedness and Far-sightedness
✓
Answer
| Near-sightedness | Far-sightedness | ||
| $1$. | The eye lens does not become thin as required but remains thick. | $1$. | The eye lens does not become thick as required but remains thin. |
| $2$. | The light rays from objects at far distances are focused short of the retina. As a result, the distant objects cannot be seen clearly. | $2$. | The light rays from objects nearby the eyes are focused behind the retina. As a result the nearby objects cannot be seen clearly. |
| $૩$. | The light rays from objects nearby eyes are focused on the retina. As a result, the nearby objects are seen clearly. | $3$. | The light rays from distant objects are focused on the retina. As a result the distant objects are seen clearly. |
| $4$. | This defect can be corrected by using concave lens of appropriate focal length. | $4$. | This defect can be corrected by using convex lens of appropriate focal length. |
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