A Guide To Buying Sunglasses

1. First of all, check the quality of the lens to see whether the surface of the lens is smooth, and whether there are warping, abrasion marks and bubbles. Lens warping will cause vision deviation, uneven or traces, bubbles, will cause dizziness and other discomfort. Also note that the lens should not be too thin, or heat deformation will also cause dizziness.

2. Can take sunglass to be apart from the eye 45 cm place, observe the vertical line and horizontal line around through glasses, wait for example window Frame or door frame, move glasses up and down again before and after. If the straight line distorts or swings, it means that the lens is out of shape and should not be purchased.

3. Sunglasses also have an important index of light transmission ratio, which is the ratio of the luminous flux through the lens and the incident luminous flux. It is also an important performance index stipulated by a mandatory standard. If light-colored sunglasses are used for shading, the wearer will not be able to obtain the shading effect. Use shading glasses for light sunglasses to affect the wearer's vision.