The Important Thing Is The Appropriate Eyeglasses Refractive Index
The eyeglass online matching requires attention to the selection of eyeglass frames, choosing the right frame for oneself, firstly comfortable, and secondly good-looking. To understand what your face shape is, whether your nose is straight or not, and what is the width of your head.
Eyeglass frames are designed to fit ergonomics in terms of comfort, but it still depends on the size and material of the frame. For example, if your nose bridge is flat or not straight, it is recommended to choose a frame with adjustable lifting brackets.
Then pay special attention to the size of the discountglasses frame, usually using the current frame as a reference, and check the size of the original glasses, usually marked inside the temple for measurement. If the original frame size is appropriate, try to choose a similar size.
If the old glasses data has been worn out, it is recommended that you measure the comfortable glasses you used to wear with a ruler and record the total width of the frame and the width inside the frame. The width inside the frame can be adjusted according to the actual tightness of the wearing.
There are two things to note about lenses: generally, lenses are divided into single lens and double lens. Single lens refers to a single-sided non-spherical lens, while double lens refers to a double-sided non-spherical lens. Relatively speaking, the double nonlenses are relatively good. The double nonlenses have curved edges on both sides of the lens, which makes the actual product clearer and less deformed.
The refractive index of discountglasses should be selected based on their actual degree (at the same degree, the higher the refractive index, the thinner the lens. Ordinary glasses usually have thinner lenses with higher refractive indices, not necessarily better. The most important thing is that the refractive index is appropriate.
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