Presbyopia is a normal physiological phenomenon, not an eye disease, nor does it occur in elderly individuals. After the age of 40, as the lens of the human eye gradually hardens, the Ciliary muscle gradually becomes paralyzed, which makes it impossible for the human eye to effectively adjust the shape of the eye (axial change). The only way to see clearly is to adjust the distance between the eye and the object you are looking at. When you look at objects near you, you must move far away. This state of the eye is called presbyopia.
If presbyopia wants to use its vision at the distance it used to be, it is necessary to wear presbyopia glasses for visual supplementation in order to regain close and clear vision. It is no exaggeration to say that presbyopia glasses are the second pair of eyes for everyone after entering middle age. The degree of aging is related to age. For example, at the age of 45, presbyopia is+1.50D (150 degrees), and by the age of 50, whether you wear glasses or not, presbyopia will increase to+2.00D (200 degrees). There has been presbyopia, so it is unwise not to wear presbyopia glasses, so the Ciliary muscle can not adjust even if they are exhausted, which will definitely aggravate reading difficulties, produce many symptoms such as dizziness and eye swelling, and affect life and work. So, presbyopia glasses should be paired as needed without delay. After increasing age, the original reading glasses are not strong enough and should be replaced in a timely manner. Therefore, reading glasses cannot be worn to the end. Wearing inappropriate reading glasses for a long time not only brings many inconveniences to one's life, but also accelerates the process of eye aging.
Generally speaking, there are two main manifestations of presbyopia in the early stages: the first is close work or difficulty reading. For example, when reading, one needs to hold the book far away or read in a place with strong light to see clearly. The second is Eye strain. With the decrease of accommodation, the reading demand gradually approaches the limit of accommodation, that is, when reading, almost all the accommodation of the eyes must be used, which leads to the inability to use the eyes for a long time. At the same time, Eye strain symptoms such as eye swelling and headache are likely to occur due to excessive accommodation. The occurrence of the above two phenomena indicates that the eyes may be starting to age. For nearsighted individuals, it is also a sign of presbyopia to remove their glasses or pull the reading material away when reading at close range. After experiencing presbyopia, the safest way is to wear appropriate reading glasses for correction.