Because the prescription of presbyopia increases with age, it will generally deepen accordingly, so it is better to go t

Because the prescription of presbyopia increases with age, it will generally deepen accordingly, so it is better to go to optometry every three or five years, rematch a suitable pair of glasses, and do not wear too shallow glasses for a long time. Older people struggle to see when reading books, newspapers, or working in close proximity, and they have to distance themselves a little more to see clearly.

If it takes a long time, eye fatigue will occur, which is "presbyopia". Proper reading glasses must be worn in order to achieve clear vision. The approximate prescription of reading glasses required for the usual emmetropic eye with age; 1 diopter at the age of 40 (diopter commonly known as 100 degrees); 45 years old 1 ~ 1.5 diopters; 50 years old: 1.5~2.0 diopters; 55 years old: 2.0~3.0 diopters; Over 60 years old, 3.0~4.0 diopter or more. Reading glasses should go to the hospital for optometry, determine the prescription before wearing, and try to read reading glasses should not be overcorrected, otherwise it will cause near-sight fatigue, dizziness and other phenomena.

If the original diopter is not correct, the original power should be added or subtracted when wearing reading glasses, and the original farsightedness should be added and myopia should be subtracted. Some people with mild myopia (within 4 diopters) grow with age, and myopia and presbyopia can offset the ability to see near objects, but they still need to wear myopia glasses to see far.

People with deep myopia should wear reading glasses or shallow myopia glasses to see near objects, and it is very troublesome to wear deep myopia glasses to see distant objects, and it is very troublesome to put on and take off two pairs of glasses, so you can wear a kind of "bifocal glasses" The upper half is used for television, and the lower half is used to see near or progressive films.

Since the prescription of presbyopia generally deepens with age, it is better to re-opt every three or five years and re-wear a suitable pair of glasses, rather than wearing too shallow glasses for a long time.