The dimensions of sunglasses
To make it easier for you to choose the right size sunglasses, we always report the length of the hand, the width of the hand, and the height of the lens as shown in the picture below.
Sunglasses for the eyes
Protecting the eyes from the sun's UV radiation is important, but the use of glasses is often also a fashion issue. The EU Directive requires that all sunglasses sold in the EU have 100% UV protection (UV400), a certificate of CE marking on the sunglass body. CE approval means that sunglasses meet all EU requirements for sunglasses (EN ISO 12312-1: 2013).
Protecting children's eyes is particularly important because the child's eye lens allows more UV radiation than an adult and radiation can penetrate up to the retina, deteriorating. Good sunglasses are large and also protect against UV radiation from the side. The UV or UV 400 marking in sunglasses indicates that the glasses completely filter UV radiation.
Polarized lenses are needed especially in snow and water.
Sunglass Cat rating
CAT classes the classification of sunglasses protection. The glare protection and UV protection are two different things.
Cat 0 - Imagolas
The lenses of the sunglasses are bright or light. Sunglasses allow 81-100% of the sun's rays. They do not protect against glare, but they have UV protection according to the EU Directive.
Cat 1 - Cloudy Weather Lens
Light permeability rate 44-80%. These are well suited for cloudy weather, with minor sunshine. In glassesis the UV protection of the EU Directive
Cat 2 - semi -cloudy weather lens
Light transmission 19-43%
CAT 3 - Sunny and Bright Weight Lens
The sunglasses of this class are the best for normal use. They filter 9-18% of the light and thus provide good comfort even on sunny weather.
Cat 4 - Dark Lenses
Really dark lens for extreme conditions such as mountains or desert. The light transmission rate is only 3-8%. The lens is so dark that these sunglasses should not be used, for example, when driving a car.