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How to set lens groove style with a groover...

2025 World Glasses Exhibitions...

Do you now how to increase the success rate of shoot fundus image with portable fundus camera?...

Spheres : The curved surface forms a part of the spherical lens and the dioptric power on all axis positions is the same. After passing the lens, the light beam focuses in one point (or a virtual focus). Spherical lens includes concave lens （ - ） and conv...

Presbyopia is a physiological phenomenon that generally begins to appear between the ages of 40 and 45, as the eyes age, the elasticity of the crystalline lens weakens, meaning that the camera lens cannot freely retract and retract, resulting in the objec...

Blue light is divided into two types: beneficial and harmful, the blue light with wavelengths between 415 and 455 nanometers is harmful blue light in short waves and requires special attention to protection...

There are 18 worldwide Glasses Exhibition in 2024, check the detail date here......

The thinness of the frame material is the single most important factor in determining the proper heat setting for warming. The thinner material , the faster it will heat up . Lighter , thinner frames will heat and cool much faster than heavier , thicker f...

Latested LE-520 with 3rd mainboard and new function of Lens sliding prevention, grinding wheel are same with LE-420....

When purchasing lenses, many people may find that they do not understand why they choose to coating lenses that are resistant to blue light, and the differences between film layers are not very clear. So, let's popularize the most common blue film and gre...