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　performance index

　Structure

a) The surface shall be smooth, free of burrs, sharp angles or other defects that may cause eye discomfort;

B) The surface of the lens shall be flat, smooth and free of scratches, waves, bubbles, impurities or other obvious defects that may impair vision;

c) Adjustable parts or structural components shall be easy to adjust and replace.

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headband

Any part of the headband in contact with the wearer should be kept at least 10mm wide, the headband should be adjustable, and the material selected should be soft and durable.

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Manufacturer:Zhengzhou Xuanying Medical Technology Co., Ltd.