Question

name 2 main defects of vision. Explain the cause and correction of these defects.

Answer 1

Answer:

The vision becomes blurred due to the refractive defects of the eye. There are mainly three common refractive defects of vision. These are (i) myopia or near-sightedness, (ii) Hypermetropia or far – sightedness, and (iii) Presbyopia. These defects can be corrected by the use of suitable spherical lenses.

Explanation:

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Answer 2

Answer:

• Myopia
• Hypermetropia

Explanation:

1. Myopia causes light rays to focus on one point in front of the retina, rather than direct on the surface.
2. Hypermetropia causes insufficient eye length and impossibility for light rays to be focused on retina.