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Presbyopia glasses, also known as old glasses, is a class of optical products, for the eyes of presbyopia people used glasses, belongs to a convex lens.Reading glasses are mainly to meet the needs of people with presbyopia.Reading glasses are used for the middle and old people to supplement eyesight, it has the optical index that a lot of national standard sets like myopia mirror, also have a few special use rules.It is the same as regular sunglasses, and customers can judge whether it is suitable to buy by the style and color alone.Presbyopia is a normal physiological phenomenon, not an eye disease, nor is it an old talent.After the age of 40 years old, as the lens of the human eye gradually fiber sclerosis, ciliary muscle gradually paralysis, so that the human eye can not effectively adjust the shape of the eyeball (axial change), only by adjusting the distance between the eye and the object of view, to see the near object must move far to see clearly, then the eye state is called presbyopia.Presbyopia wants to want to use eyesight on the distance that goes up in habit must wear presbyopia to undertake visual acuity is added, ability sees afresh close and clear, say without exaggeration, presbyopia is the second pair of eyes after everyone enters middle age.The use of reading glasses, to improve people's quality of life, played an indispensable role.Presbyopia is related to age.For example, at age 45, presbyopia is + 1.50d (150 degrees), and at age 50, whether you wear glasses or not, it increases to + 2.00d (200 degrees).Already appeared presbyopia, strong support does not wear presbyopia glasses, so ciliary muscle is exhausted also cannot adjust, certain meeting aggravates reading difficulty, produce a lot of symptom such as dizzy eye bilge, affect life and work, this is very unwise.So, presbyopia glasses when matching that match, do not delay.After the age grows, the presbyopia degree that matchs ly is not enough, also want to change in time.Therefore, reading glasses can not be worn in the end.Wear improper reading glasses for a long time, not only can bring a lot of inconvenience to their lives, but also can speed up the process of eye reading.