Difference Between Presbyopia and Hyperopia
Generally speaking, myopic eyes can accurately and clearly form an image in the macula of the retina when looking at objects five meters away, and can see very clearly. This is a normal eye. And if the object looks very blurry, like falling in front of your retina, causing things to blur, this is the problem of focusing, and focusing in front of the retina is myopia. The characteristic of myopia is that as long as you move closer, it becomes clearer, while as you move farther, it becomes less clear, which is why it is called myopia.
And presbyopia is a physiological change. As age increases, the hardening and regulating function of the lens gradually weakens, and a small part of it is caused by the decline of the ciliary muscle, which makes it difficult to see closely. It is necessary to wear presbyopia glasses. The age at which presbyopia occurs is not consistent, which is related to one's refractive state and the nature of each individual's work. Generally, emmetropic individuals before the age of 40 do not need to wear sunglasses, while those with hyperopia have a closer point than those with emmetropia, but there is no difference in the reduction of their regulatory power.
The glasses used to correct myopia are concave lenses. The image formed by a concave lens is always smaller than the upright virtual image of the object, and concave lenses are mainly used for correcting myopia. Presbyopia glasses are the opposite of convex lenses.
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