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Common defects of vision that can be corrected by the use of suitable eyeglasses or spectacles

There are mainly four common defects of vision that can be corrected by the use of suitable eye glasses or spectacles. These are
(i) Myopia or near-sightedness,
(ii) Hypermetropia or far-sightedness,
(iii) Presbyopia, and
(iv) Astigmatism.

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