When you choose sunglasses, you need to consider the following factors: UV index, colour, shape, material and weight.
UV index refers to the effect of filtering ultraviolet rays, regular sunglasses are 100% UV protection, that is, we often see a "100%" logo on the lens. Ultraviolet light is very harmful to the eyes, so buy sunglasses must buy UV400, can block more than 99% of the ultraviolet light.
In terms of colour, light-coloured sunglasses have a transmittance ratio of 43%-80%, which is the lightest colour, shading and reducing the amount of light transmission at least, and are mostly used for fashion accessories; light-coloured sunshade sunglasses have a transmittance ratio of 18%-43%, which is slightly lighter in colour, and are more suitable for cloudy or cloudy days; sunshade sunglasses have a transmittance ratio of 8%-18%, and most of the sunglasses belong to this level, which is more suitable for outdoor activities such as seaside and mountaineering.
Sunglasses come in a variety of shapes and materials, such as round, square, oval, cat's eye and so on. The materials are acetate, carbon fibre, pure titanium, alloy and so on. Different materials have different characteristics, for example, plate sunglasses are more suitable for modifying face shape, while pure titanium sunglasses are more fashionable and simple.
The weight of sunglasses not only depends on the weight of the frame material, but also affected by the thickness and size of the frame and lenses, generally the weight of the lenses of sunglasses with no degree will not be very big. Therefore, the best sunglasses are lightweight, comfortable to wear, no pressure, not easy to slip, and in line with the facial features of most people.
Post time: Aug-14-2023