Question

defien defects of vision​

Answer 1

Answer:

There are mainly three common refractive defects of vision. These are (i) myopia or near-sightedness (ii) Hypermetropia or far – sightedness (iii) Presbyopia.

Answer 2

Answer:

• If the rays of light fall through the lens in parallel and if the focus is precisely on the retina of the eye, a sharp image is created on the retina. In this case, there is no defective vision. However, if the eyeball is too short or too long, the focus is in front or behind the retina and there is deficient vision.
• There are mainly three common refractive defects of vision. These are (i) myopia or near-sightedness (ii) Hypermetropia or far – sightedness (iii) Presbyopia.

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