Do not change the degree? wrong! Glasses also have a shelf life

Some people think that as long as the degree of myopia is constant, the glasses do not need to be replaced if they are not bad. In particular, some middle-aged and older people think that the degree of myopia is stable, and they can be worn for a long time with a pair of glasses. Li Lihua, director of the Optometry Center of the Municipal Eye Hospital, suggested that the glasses actually have a shelf life, and the lenses and frames must be regularly changed.

Myopia lenses are not only in degree, but also include parameters such as refractive index, light transmittance, and ultraviolet resistance. For example, the lens will receive sunlight in the outdoor, long-term absorption of ultraviolet red light, the material will be damaged, and the image quality will be reduced. With daily wear, the lens wears out, resulting in reduced light transmission. The requirements for the lens are not limited to being visible. It is recommended that the public perform an optometry every other year and check if the ophthalmic lens needs to be replaced.

The frame is more than just a tool for carrying the lens. The new glasses frame is designed according to parameters such as the distance between the eye, the distance between the eyes and the diopter. After long-term use, especially for those who are used to wearing glasses with one hand or glasses when lying on the side, the frame will be deformed. Using glasses that have been deformed by the frame will affect corrective vision. It is recommended that the public should adjust the frame every three months to six months.

In addition, refractive correction helps to protect the eyes. If you use "expired" glasses for a long time, light fatigue, tears, headaches, dry eyes and other visual fatigue symptoms may occur, and severe astigmatism and strabismus may occur. For adolescents, not only can not achieve the purpose of correcting vision, but also increase the degree of myopia in the eyes. Middle-aged and elderly people will accelerate the incidence of senile eye diseases such as cataract, glaucoma and retinopathy.