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प्रश्न
Differentiate between the Following:
Myopia and Hyperopia
अंतर स्पष्ट करें
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उत्तर
| Basis of Difference | Myopia (Short-sightedness) | Hyperopia (Long-sightedness) |
|---|---|---|
| Visual Symptom | A person can see nearby objects clearly, but distant objects appear blurred. | A person can see distant objects clearly, but nearby objects appear blurred. |
| Point of Image Formation | Light rays from a distant object focus in front of the retina instead of on it. | Light rays from a near object focus behind the retina instead of on it. |
| Anatomical Cause | It occurs when the eyeball is too elongated from front to back, or the lens/cornea is excessively curved. | It occurs when the eyeball is shorter than normal from front to back, or the lens is too flat. |
| Corrective Measure | It is corrected by using spectacles fitted with a suitable diverging (concave) lens. | It is corrected by using spectacles fitted with a suitable converging (convex) lens. |
| Lens Prescription Power | The corrective lens prescribed has optical power denoted with a minus ('−') sign. | The corrective lens prescribed has optical power denoted with a plus ('+') sign. |
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