Reading glasses, also known as reading glasses, are a type of optical product, glasses for people with presbyopic eyes, which belong to a convex lens. Reading glasses are mainly to meet the needs of people with presbyopia.
Reading glasses are used to supplement the eyesight of middle-aged and elderly people. Like myopia glasses, they have many optical indicators stipulated by national standards, and also have some special rules of use. The use of reading glasses has played an indispensable role in improving people's quality of life.
There are three main types of reading glasses on the market, namely single vision mirrors, double vision mirrors and progressive multifocal lenses. The single vision lens can only be used to see near, and you need to take off the glasses when looking far. Bifocals mean that the upper half of the lens is used to see far away, and the lower half of the lens is used to see near. Progressive multi-focal lenses can meet the needs of viewing objects at different distances from far, middle and near, and the appearance is also very good. The popularity rate in 2019 has been increasing year by year, and the first generation has a long time to adapt.
Presbyopia is a normal physiological phenomenon, not an eye disease, nor is it unique to the elderly. After the age of 40, as the lens of the human eye gradually hardens, the ciliary muscle gradually becomes paralyzed, so that the human eye cannot effectively adjust the shape of the eyeball (axial change), and can only see near objects by adjusting the distance between the eye and the object. Objects must be moved far away to see clearly, and the eye condition at this time is called presbyopia.
If presbyopia wants to use vision at the original habitual distance, it must wear reading glasses to supplement vision, so as to regain clear near vision. It is no exaggeration to say that reading glasses are the second pair of eyes for everyone after entering middle age. The degree of presbyopia is related to age. For example, at the age of 45, the presbyopia is +1.50D (that is, 150 degrees), and at the age of 50, whether you wear glasses or not, the presbyopia will increase to +2.00D (that is, 200 degrees). Presbyopia has already appeared. If you insist on not wearing reading glasses, the ciliary muscles will be exhausted and cannot be adjusted. It will definitely aggravate reading difficulties, cause dizziness and many other symptoms, which will affect life and work. This is very unwise. Therefore, reading glasses should be matched immediately without delay. After getting older, the prescription reading glasses originally provided are not enough, so they need to be replaced in time. Therefore, reading glasses cannot be worn to the end. Wearing inappropriate reading glasses for a long time will not only bring a lot of inconvenience to your life, but also accelerate the process of presbyopia.