Question

1. What Causes Myopia?
2. What Causes Hypermetropia?
3. What Causes Presbyopia?​

Answer 1

1. Myopia, or short-sightedness, occurs when the eyeball is too long so it affects how the cornea and lens focus. This means objects in the distance appear blurry because light rays are focusing at the front of the retina rather than directly on its surface.

2. In an eye with hyperopia, light rays entering the eye focus behind the retina, rather than directly on it. Typically, this is because the eyeball of a farsighted person is shorter than normal.

3. Presbyopia is caused by a hardening of the lens of your eye, which occurs with aging. As your lens becomes less flexible, it can no longer change shape to focus on close-up images. As a result, these images appear out of focus

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Answer 2

Answer:

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1.Nearsightedness usually occurs when your eyeball is longer than normal or your cornea is curved too steeply. Instead of being focused precisely on your retina, light is focused in front of your retina, resulting in a blurry appearance for distant objects.

2.There are many causes for this condition. It may occur when the axial length of eyeball is too short, or if the lens or cornea is flatter than normal. Changes in refractive index of lens, alterations in position of the lens or absence of lens are the other main causes.

3.Presbyopia is caused by a hardening of the lens of your eye, which occurs with aging. As your lens becomes less flexible, it can no longer change shape to focus on close-up images. As a result, these images appear out of focus.