When the weather is becoming hotter and hotter, many fashionable young people like to wear cheap Oakley sunglasses when they go out. In addition to a wide range of styles, what kind of sunglasses can protect eyes most? Wearing dark sunglasses on the eyes of the damage is actually greater. Because dark glasses will not only make us look dim, but also make the pupil bigger. By the amount of ultraviolet radiation in the pupil area, the range of damage to the lens and retina will become wider, easily lead to glaucoma, cataracts.
The main source of ultraviolet light is the sun, the sun’s light through the atmosphere, the length of the ultraviolet light absorbed by the ozone layer in the atmosphere, 290nm, and the impact on the human body is mainly UVA and part of UVB. Therefore, the choice of replica Oakley sunglasses when it is determined that the standard UV400, you can block the following UV 400nm.
Blue light is the biggest damage to the eyes, yellow lenses can play a role in reducing visual fatigue, make the eyes more comfortable, can effectively prevent most of the harmful light. Generally speaking, gray lenses can absorb infrared and ultraviolet 98%, while the yellow or brown lens can filter out a large number of blue light, thereby greatly improve the visual contrast and clarity. Especially in patients with macular disease, should be wearing yellow glasses, blue tinted lenses or reduce the damage, but also good.
In addition to the lens is unable to distinguish ultraviolet shielding, consumers in the purchase of sunglasses, through the quality of visual examination of lens. Should pay attention to whether the lens surface is smooth, no scratches and bubbles. The lens flat, from the horizontal direction to observe whether the existence of warp lens. Can also get away from the eye sunglasses at 30 cm, observe the vertical lines around and horizontal lines through the glasses, such as a window or door frame, intends to glasses before and after moving, as found in the observed line appear distorted or swing, shows the lens may be deformed, it should not buy sunglasses.
Another method is to be placed in front of fake Oakley sunglasses, the lens is convex outward, moving slowly, observe distant objects from the inner side of the lens. If most of the objects are stationary, there is a similar ripple, which indicates that the surface is uneven. The surface looks uneven or defect and bubble lens wear will cause dizziness and discomfort, can not buy.
It is best to buy foakley Sunglasses in a regular glasses shop, pay attention to the lens surface should be smooth, no bubbles, no scar; the lens is placed in the horizontal direction to observe the lens without warping, uneven. Lens color selection, should be put on after the color of the surrounding environment without distortion, the edge of the object clear principle, generally at moderate depth as well, such as light gray, tea color, the color of the infrared and ultraviolet absorption good sunglasses.