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Differentiate between myopia and hypermetropia. What type of spectacles should be worn by a person having the defects of myopia as well as hypermetropia? How does it help?
The differences between myopia and hypermetropia are as follows:
| S.No. | Myopia (short-sightedness) | Hypermetropia (long-sightedness) |
| 1. | It is a defect of vision due to which a person cannot see distant objects clearly.
| It is a defect of vision due to which a person cannot see nearby objects clearly.
|
| 2. | The far point of a myopic eye is closer than infinity. | The near point of a hypermetropic eye is more than 25 cm away. |
| 3. | It occurs because the eye lens has high converging power, or the eyeball is too long. | It occurs because the eye lens has low converging power, or the eyeball is too short. |
A person having a defect of myopia should wear spectacles with concave lenses as this lens decreases the converging power of the eye lens helping to form the images of distant objects on the retina of the myopic eye.
A person having a defect of hypermetropia should wear spectacles with convex lenses as this lens increases the converging power of the eye lens helping to form the images of nearby objects on the retina of the hypermetropic eye.
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