Question
Difference between
Near - sightedness and far - sightedness
Near - sightedness and far - sightedness
| 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. |
| 3. 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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