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What is the principle of reading glasses of Wenzhou Wanrun glasses manufacturer

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The principle of reading glasses is the convex lens principle, which uses the condensing effect of the convex lens to move the image of the object forward to the retina. Presbyopia, also known as presbyopia, is an optical product used by presbyopia patients. Presbyopia glasses are mainly used to meet the needs of presbyopia patients. Reading glasses are used to supplement the eyesight of middle-aged and old people. Like myopia glasses, they have many standard optical indicators and some special rules for use.

Extension: Generally speaking, spectacle lenses can be divided into two categories, namely glass lenses and optical resin lenses. The glass lens includes an optical glass lens and a high refractive index lens (commonly referred to as an ultra-thin lens). They have high hardness and good wear resistance. Generally, their quality and various parameters do not change with time. However, the impact resistance and weight of glass lenses are slightly lower than those of resin lenses.

Resin lens is generally much lighter than glass lens, and its impact resistance is better than glass lens, but its surface hardness is low and it is easy to scratch. Resin lens and coated lens are relatively soft, so care should be taken not to let the mirror directly contact hard objects. When scrubbing, it is best to wash with water (or mix with a small amount of detergent), and then use special test cloth or high-quality cotton paper to absorb water droplets on the glass.

In addition, in places with poor environmental conditions, coated lenses should be used carefully to avoid dirt and difficulty in cleaning. The article is from the Internet. If there is any infringement or violation, please contact us for deletion.

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