Question

Write an article about the different defects that are caused in 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. Myopia is also known as near-sightedness

Explanation:

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Answer 2

There are four types of visual defects: myopia, hyperopia, presbyopia, and astigmatism.

Explanation:

1. Myopia: Myopia is also known as nearsightedness since people with it can only see objects in close proximity in sharp focus. It's caused by the cornea's curvature being excessively great in comparison to the eyeball's length. The light rays in the eye are focused in front of the retina rather than on it as a result of this.
2. Hyperopia: Farsightedness, or hyperopia, is the polar opposite: persons with it can see clearly far away but not up close. It is caused by a lack of corneal curvature in relation to the length of the eyeball. The light beams' focus point is now behind the retina rather than on it.
3. Presbyopia: Presbyopia is an age-related disorder in which the lens' capacity to alter shape deteriorates. The eye's capacity to adjust at varied distances, particularly close up, is harmed as a result, and the weakly bundled light rays do not focus on the retina.
4. Astigmatism: The cornea is distorted with astigmatism, and the light entering the eye is not correctly focused. The light is spread out among two or more locations instead of hitting the retina in a single focused spot. As a result, the image becomes hazy or stretched.