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Hypermetropia

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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.

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Myopia can be cured using the concave lens. This is because using the concave lens can bring the image of the object kept at some distance within the far point and point of least distance of the distinct vision with the help of the lens. This image will act as the object for the eye lens.

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Presbyopia is the gradual loss of your eyes' ability to focus on nearby objects.

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violet colour is the least deviated colour of light

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