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From 2023 to the end of 2024, both new and old buyers with  orders above $35 can participate. Short videos are the main  content (graphic blogs ca...

red lenses glasses block close to 100% of both blue and green wavelengths. While many glasses block only blue light, recent studies have shown that...

When most people wear glasses, they are basically exposed to spherical mirrors (myopia or hyperopia) and cylindrical mirrors (astigmatism). In addi...

The light reflected from the object surface has been partially polarized to produce glare. The opposite effect of glare is to increase brightness, ...

1) What is the refractive index?The higher the refractive index of the material, the stronger the ability to refract the incident light. The higher...

With the development of science and technology, the types of glasses are rich and colorful. In recent years, a kind of glasses called progressive m...

The definition of high astigmatism in textbooks is that when it reaches 75 degrees, it means high astigmatism, but in practice, when it reaches 150...

The diameter of myopia spot lenses is 65-80, the most common is 70 or 75 diameter, and 80 diameter is relatively rare. The central thickness, refra...

The so-called "lens distance" is defined as the distance between the inner surface of the lens and the apex of the cornea.The distance between lens...

Knowledge of glasses industry1) The myopia lens is a concave lens, which is thin in the middle (cannot be thinner than 1.0mm). The thicker the edge...

When the distant parallel light enters the refractive system of the human eye, it forms a focus behind the retina, which is called hyperopia. Use a...

1. Do not take off and wear glasses frequently, which will cause frequent activity from the retina to the lens, which may easily cause the degree t...