Glasses are a device that can improve and make easier the life of people which have vision problems as well as provide the needed protection when it comes to the harmful effect that the ultraviolet and visible sun rays have. Depending on the purpose they are used for there are many different types of glasses such as sunglasses, corrective glasses, protective glasses and many others. For those of the people who want to equip them with the appropriate glasses here is some needed information. Corrective glasses is the most famous and needed type of glasses because they help to the people with different vision problems such as astigmatism, far and nearsightedness. People with that kind of eye problems find it difficult to see in shorter or longer distances as well as those of them who have problems with the distances between their pupils in case of astigmatism. For all of these vision problems Corrective glasses are used in order to improve the vision and to make possible for the person who wears them to see. This vision correction is only possible because of the diopter with which the lenses of the glasses are made. This diopter is the main reason for the corrective glasses to make possible better vision when the person has eyes problems. The diopter depends only from the individual needs but it is known that for far and nearsightedness it has to be positive and negative as it follows. On the other hand when there is astigmatism the angle of the lenses is the thing that is important. The rims of the glasses are various and they depend only on the individual preferences. The rims as well as the lenses are lightened and made to be scratch- resistant in order to be used for longer time. Corrective glasses have crucial role for people with vision problems because without them these people will not be able to see clear and to have normal and fulfilled life. Glasses are not only used for vision problems correction but also for sunlight protection. Sunglasses are that type of glasses that assure protection when it comes to the damaging effect that the sun beams have to your eyes. Longer exposure to sunlight without sunglasses can cause very serious eye disease like eye cancer. There are also many people who feel discomfort when doing outdoor activities because of the bright sun light. For children sunglasses are even more important than for adults because the lenses of the children eyes transmit more detrimental beams and that can cause serious eye diseases and vision problems. The sunglasses recommended have to reflect 95-100% of the injurious sunrays. The European standard for sunglasses is to reflect 95% of the harmful for the eyes sun rays and they are labeled to have UV 400 protection.