Presbyopia, like myopia, is an inability to see clearly and requires wearing tools to help correct it.But there are essential differences between the two.What is the difference between presbyopia and farsightedness?Recommended reading: How to choose myopic glasses frame?
Generally speaking, myopia is looking at the object beyond 5 meters, can form an object clearly and accurately in the macula of eyeball retina, see very clearly, this is a normal eye.And if you look at the object and it's very blurry, like it's in front of your retina, and it's weak, that's the problem of focusing, and focusing in front of your retina is myopia.The characteristic of myopia is that as long as you move forward, the closer you are, the clearer you will be. The farther you go, the less clear you will be. That's why it is called myopia.
Presbyopia is a physiological change. With the increase of age, due to the gradual weakening of the lens hardening regulation function, a small part of the ciliary muscle recession causes difficulty in seeing near, and reading glasses should be worn.The age at which presbyopia occurs is not consistent, which is related to my refractive state and the nature of each person's work.In general, emmetropics before 40 years of age do not need to wear glasses, and hyperopia patients are farther away from the near point than emmetropics, but there is no difference in the decrease of adjustment between the two.
The glasses used to correct myopia are concave lenses.The image produced by concave lenses is always smaller than the upright virtual image of the object, and concave lenses are mainly used to correct myopia.Presbyopic glasses are the opposite of convex lenses.
