Preschoolers don't wear sunglasses
The human eye has automatic adjustment function, the pupil will automatically adjust the size according to the variation of ambient light, guaranteed by light to maintain at a reasonable level. Children before the age of 8 of retina is still not fully mature, in the process of retinal development needs clear vision to promote development, if prematurely wear sunglasses, into the eyes of the light had major general bad for children eyesight development. Ray-ban sunglasses RB4225 men 646/55 transparent so, preschool children had better not casual wear sunglasses. Ray-ban sunglasses RB4222 men 622/8 g grind arenaceous black/lenses grey sunglasses are of variable quality that sells on the market at present, a lot of unqualified sunglasses that block uv function, no once put on, the pupil will be down in dim light is big, the eyes will enter more ultraviolet ray, protect the eyes instead. Ray-ban sunglasses RB8056 men 175/6 q hawksbill if really need to do protection to the eyes, going to the store to buy good quality sunglasses, formal as far as possible choose grey and dark brown lens, but it's best not to wear for a long time.
related: sun glasses sunglasses