Knowledge

For light colored sunglasses, their light transmittance should be>40%; For sunshades, the range of light transmittance is 8% to 40%. The light tran

The prism degree of sunglasses should be 0.00 Δ, If the lens has a prismatic degree, it will cause the focus of the visual object to shift. If i

The nominal top power value of sunglasses should be 0.00D. Deviations during lens manufacturing or mismatched assembly of the lens and frame may resul

A common problem with sunglasses is back glare, which is caused by the reflection of light onto the back of the lens and back into your eyes. The func