Buy reliable places: the online stores and retail chains notes have an internal system of quality management. In addition, with the collaboration of independent technical service providers to optimize the safety and quality of their products.
Small shops along the beach or street vendors, often do not avail themselves of these services.
Quality control of manufacturing sunglasses: When buying glasses, it is good that the consumer controls carefully what you are going to buy. One way to control the quality, is to open and close the temples of the glasses more times. If you feel any resistance or turn out to be very unstable, this is the first sign of poor quality of the manufacture and / or that the materials used for their production are cheap materials.
Control of the optical quality: quality control perspective, you need to focus a point at a certain distance, alternating a time wearing glasses and once without glasses. If you wear glasses when the set point is less sharp or blurred, it is not recommended to purchase.
Look for the CE marking and the filter category: the CE marking together with the category of the filter must be reported on both the safety instructions both on the glasses. The filter category indicates whether the sunglasses are suited to driving. For example, if the sunglasses indicate filter 4, can not be worn while driving since it is an indication that the lenses are too dark and could cause problems of visibility, in particular inside a tunnel making it difficult or even the recognition of traffic light.
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