How To Tell Whether Sunglasses Are Good Or Bad?

● When purchasing sunglasses, you must first check the quality of the lenses. Whether the surface of the lenses is smooth and whether there is warping, wear marks, or bubbles. Warping of the lenses will cause vision deviation, and unevenness or marks or bubbles will cause dizziness and other discomforts. At the same time, the lenses should not be too thin, otherwise high temperature deformation will also cause dizziness.
● When selecting, you can hold the sunglasses 45 cm away from your eyes, observe the surrounding vertical and horizontal lines through the glasses, such as window frames or door frames, etc., and then move the glasses up, down, and forward. If the straight lines are distorted or swinging, it means that the lenses are deformed. Not suitable for purchase.
● Also pay attention to the color of the lenses. There should be enough depth, dark gray is better, dark brown and black are second, blue and purple are the worst. These two lenses will transmit more ultraviolet rays. Try not to use yellow, orange and light red lenses.
● It is best to choose products with 100% UV protection clearly marked on the label, and sunglasses should only be worn in the sun. There is no need to wear them on cloudy days or indoors.