How to choose the right glasses?

When deciding on the choice of sunglasses, it is important to consider the conditions in which we will use the glasses. In different conditions, we can encounter different  intensities of solar radiation. Therefore, there are different types of lenses with a certain light transmission. This light transmission is stated as the amount of light expressed in percentages that is able to penetrate the pupil. The higher the percentage, the more light the lens lets through. A visor with transmittance above 90% is therefore suitable for worse lighting conditions, e.g. cloudy, overcast or snowy. Conversely, lenses with a lower percentage of transmittance are suitable for situations where it is necessary to better protect the eyes from strong sunlight.

Sun filter category

Category	Light transmission	Properties	Use	Symbol
CAT 0	80 - 100 %	Transparent glasses, suitable for protective sports glasses, thanks for the sporty halo.	cloudy, dusk
CAT 1	43 - 80 %	Glasses with slightly colored lenses, often yellow or orange. Their most important function is to brighten the surroundings. They are suitable for poor lighting conditions in autumn or winter or in the dark.	fog, cloudy
CAT 2	18 - 43 %	Classic universal permeability, most common in urban fashion glasses. It also fits in the car due to its balance when moving from sun to shade. It appears less often with sports glasses.	partly cloudy
CAT 3	8 - 18 %	This category of solar transmission is most typical for sports glasses. Due to their relatively high blackout, they are suitable for summer days, for sports that require good visibility. It is not suitable for darkness or poor lighting conditions.	clear, sunny
CAT 4	3 - 8 %	Special very dark glasses for more extreme conditions. For deserts or glaciers, this surface has a large number of reflective surfaces. These glasses must not be used when driving a car!	extremely sunny

User information for the use and care of sunglasses

PROGRESS EYEWEAR sunglasses 100% protect the eyes from UV radiation and comply with the European Directive 89/686/EEC in accordance with the EN ISO 12312-1:2013 standard harmonizing with Czech technical standards according to Act No. 22/1997 Coll. as amended, Government Regulation No. 21/2003 Coll. The glasses meet the conditions for normal wear, and if they are marked with a higher filter category, they can also be used in brighter conditions. The sun filter category is indicated on the inside of the temples.

Terms of use

Do not use sunglasses if the lenses are scratched. Do not wear glasses when driving at night. Not intended for direct viewing of the sun! Do not use as protection against artificial light sources (e.g. in a solarium). Sunglasses do not protect against mechanical damage to the eyes. Always put on and take off with both hands and do not expose them to temperatures above 55°C.

Instructions for storage and care

Use a soft cloth or clean water to clean and dry. Clean with neutral, non-aggressive products. The effect of chemical substances (even chemically treated or salt water) can irreversibly damage the product, in this case, immediately rinse the glasses thoroughly in clean water and dry them. Damage caused in this way is not covered by the claim. Store in a case to avoid scratching their glass.

Country of origin: China