Visit：617 Date：2019-11-18

The latest research shows that different styles of sunglasses have a great difference in the degree of glare. In terms of size, it can be appropriately larger when selected. Most tourist sunglasses have no luminosity, which is not limited by the pupil distance. A slightly larger mirror surface can make the field of vision more open, but the arm weight should be evenly distributed on the ear and nose bridge.

Generally speaking, tourist glasses are slightly larger than ordinary glasses by 4-6 mm. In terms of color, deep-colored sunglasses can effectively block glare, and its transmittance in the visible region may be only 10%-30%, while the transmittance of light-colored sunglasses in the visible region is generally 40%-80% ( Ordinary colorless spectacle lenses generally have a transmittance of 90% to 99% in the visible light region. Different colors of sunglasses should be the same for blocking UV rays, and will not make a difference because of the color depth. Choosing the correct choice of sunglasses, the deputy chief physician of the 30th Hospital of the People's Liberation Army, Guo Qing, said that wearing glasses with too dark color will make the eyes in the darkroom environment. The pupils will automatically expand in the dark environment, and the long-term enlargement of the pupils will easily cause glaucoma and other diseases; Inferior sunglasses can also cause more UV rays to penetrate into the eyes, which can easily cause diseases such as cataracts, solar keratitis, corneal endothelium damage and ocular degeneration.

 Experts say that when buying sunglasses, first check the quality of the lens. When selecting, pay attention to the surface of the lens to be smooth, no wear marks, air bubbles, the lens is placed flat, and the lens is not warped from the horizontal direction. The sunglasses can be taken 45 cm from the eyes, and the surrounding vertical lines and horizontal lines, such as window frames or door frames, are observed through the glasses, and then the glasses are moved up and down. If the straight line is distorted or oscillated, the lens is deformed and should not be purchased. Lenses with uneven or traced or air bubbles may cause discomfort such as dizziness when worn, and should not be purchased. Second, you should pay attention to the color of the lens. To protect your eyes from infrared and ultraviolet radiation, the color of the glasses should be deep enough. Generally dark gray is preferred, dark brown and black are second, blue and purple are the worst, because the two lenses will transmit more ultraviolet light. Yellow, orange and light red are not used as much as possible.