What Are Reading Glasses?
一. What are reading glasses
What are reading glasses? Presbyopia glasses, also known as presbyopia glasses, are designed for people with blurred vision and are mostly used by older adults. So are reading glasses convex lenses? Of course, reading glasses are a type of convex lens, and the larger the degree, the shorter the focal length.
二.Are reading glasses convex lenses
The design principle of reading glasses is based on the principle of convex lenses, because as age increases, the adjustment force of the eye will decrease to a certain extent. Reading glasses belong to the aging and hardening of the lens of the eye, which cannot focus the object entering the eye on the retina as before, and nearby objects cannot be clearly imaged. This situation is a physiological phenomenon that cannot be avoided.
Reading glasses solve the problem of not being able to see objects clearly at close range. Reading glasses utilize the converging effect of convex lenses to concentrate the light emitted by nearby objects, which is then imaged on the retina through the lens. At present, there is no better way to solve presbyopia besides wearing reading glasses.
However, due to prolonged gaze, there is only one focal point, and the eyeball only adapts to this focal point, unable to autofocus, which can cause significant damage to the eyeball. So there are progressive multifocal reading glasses, gradually replacing the use of ordinary reading glasses, and the fitting of reading glasses also requires going to the hospital for optometry to seek the best visual field effect.
三. What are the classifications of reading glasses
1. A single lens is a lens with a focal point of light. The single light reading mirror is designed based on a close-up distance of 33cm
2. Double lenses, also known as bifocal glasses, etc. The diopter of a bifocal lens is composed of two different diopters: far and near.
3. Triple lens, also known as triple focal point mirror or triple focal length mirror. This type of lens is composed of three lenses: far, medium, and near.
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