I'm going to travel in a few days. I want to wear contact lenses. How about throwing contact lenses into the sun?

I feel the same way with you. It's not nice to take pictures with rimmed glasses when traveling, but it's really troublesome to bring nursing liquid when going out to buy annual and monthly throws, so it's very worry-free to choose daily throws. I usually use Cooper Optical's polishing machine for Japan and Japan, and this is what I used last time I went to Thailand. It is moist and comfortable to wear, and your eyes don't feel dry after playing for a day. Moreover, this model can filter 85% UVA and 96% UVB, which is quite suitable for outdoor travel.

Specific gravity is the ratio of the weight of the same volume of matter in the air to that of water at a certain temperature. (The specific gravity of water is 1.0), the specific gravity is the same as the density, and the unit of density (cubic centimeter) is the weight of a cubic centimeter of matter (in grams).

refractive index

1. The refractive index of lens material is the ratio of the speed of light in air (represented by n, the numerical value is 1.0) to the speed of light in material (represented by n').

2. The higher the refractive index of the material → the stronger the ability of refraction of incident light;

3. The refractive index (hydrophilicity) of soft mirror materials is related to water content. High water content → low refractive index.