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How to choose spectacle lenses according to your degree

Posting time:2022-10-06 01:24:24

How to choose spectacle lenses according to your degree

When you choose lenses in an optical shop, you don’t know how to choose the right lens according to your degree. Some friends with a high degree of refraction clearly choose the refractive index of 1.74, but the glasses are still very thick. Is the optical shop cutting corners? No With such a high refractive index? In fact, there are four main factors that affect the thickness of glasses. Refractive index: The same degree, the higher the refractive index, the thinner the lens. The following is a comparison of the edge thickness of a lens with the same diopter, the same diameter, and the same center thickness, and different refractive index lenses. It can be seen from the figure below that each time the refractive index increases by one grade, the edge thickness of the lens is about 1mm thinner, but the higher the refractive index, the higher the price. more expensive. Lens power: the same refractive index, the same diameter, the lower the power, the thinner the lens. Frame size: The smaller the frame, the thinner the lens will be. Because the lens for correcting myopia is thick at the edge and thin in the middle, the thick edge is cut off during processing. It is recommended to choose a full-frame frame for the number of heights, so that the frame can cover part of the thickness of the lens. It is not recommended to choose an ultra-light metal frame. Even if you choose the lens with the highest refractive index, the lens is still relatively thick, so it feels a bit top-heavy to wear, very Easy to slip. Interpupillary distance size: The larger the interpupillary distance, the smaller the displacement and the thinner the lens. Lesbians have a small interpupillary distance. If you choose a large frame, the amount of movement will be more, and the glasses will appear thicker. How to choose the appropriate refractive index according to different degrees? The editor summarizes it for your reference. Everyone should choose frames and lenses according to their own conditions. There is no need to blindly pursue high refractive index and ultra-light frames. The most suitable one is the best. Of course, local tyrants are free.

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