1. Check the lens quality. Look at the lens surface for smoothness, warpage, wear scars, and air bubbles. Warping of the lens can cause the line of sight to deviate, unevenness or traces, bubbles, which can cause discomfort such as dizziness.
2. Look around through the glasses. Take the sunglasses 45 cm away from the eyes, and observe the vertical and horizontal lines around the glasses, such as window frames or door frames, and then move the glasses up and down. If the line is twisted or swayed, the lens is deformed and should not be purchased.
3. Whether the sunglasses lens meets international standards. Sunglasses have a polarizing effect and anti-ultraviolet effect, pay attention to whether the sunglasses lens meets the international standard UV400, if the lens does not reach UV400 is unqualified.
In order to effectively protect the health of the eyes, daily life should be supplemented with an important nutrient for the eye, lutein. Ultraviolet light and blue light in the sun enter the eye and produce a lot of free radicals, leading to cataracts, degeneration of the macula, and even blindness. Lutein can filter blue light and ultraviolet light, decompose the damage of strong light and ultraviolet rays to the human eye, thus avoiding the damage of blue light ultraviolet rays to the eyes. Because lutein is unable to self-synthesize, and in the normal diet, nutrient supply is insufficient, it must be supplemented by external intake, so it is recommended to take a stage to protect eye health every year.