Light does not follow a straight line. Whenever it meets any reflective surfaces, it bounces back producing a glare on anything that is reflective. Therefore you can get lights reflected in your eyes from anything ranging from sand, water, glass or a shiny green grass.
Whenever you purchase sunglasses, make sure that these are large in size so that along with your eyes, the areas around the eyes get maximum protection. Apart from this, you must also ensure that the lenses of the sunglasses are of a good quality.
Good quality always refers to polarized lenses. The polarized lenses have a unique feature in them which is generally not found in other kinds of lenses. Actually the polarized lenses lets pass only vertical lights through them.
You must also consider the color of the lenses while you purchase. There are different colors available for different types of sunglasses. Choose the color in accordance with your complexion as well as the purpose for which you are wearing. If you think that you would have to spend long hours under the sun for long periods of time, you should go for brown or black. If you spend long hours under water, you should go for the blue or the green ones. In a similar way, based upon the kind of weather and the extent of the sun rays, you should choose the color of the eye wear. If you purchase from a reputed company, the experts would suggest you the color based on your requirements.
Apart from the color, there are varieties of sunglasses for varieties of occasions. For instance, if you want to wear a sunglass while fishing, you can go for the fishing sunglasses. Similarly for swimming, driving or surfing you would get different types.
If you think that sunglasses should be used only for the sunny weather, you are highly mistaken. Sunglasses are required even during cloudy or stormy weather. So while you purchase a sunglass, do not just think of your style. Purchase one which can ensure the maximum protection to your eyes in all kinds of weather. You should know the color of your lenses before you buy your pair of sunglasses. You can take them outside, in the light and find out if you feel comfortable wearing them.