Have you wondered looking through a binocular or a telescope on how it works? The size of the object keeps on changing. The image looks very close to you but they are not closer. Likewise, some image might seems to be too far but they are actually closer to you. How do size of the images vary? It is very simple to change the focus of any object or place. The lens that is used in the binocular changes the focal length of the object. This makes the change in the focus of your eye. Here you may know the importance of a lens in eyesight.
Focal length of the object and your eye will determine the distance of the object. According to the focal length of your eye, the contact lens or power glasses are prescribed. You can select the right type of specs as per your wish. There are many varieties of specs like power glasses, clear but cool glass lenses and prescription sunglass lenses are available both online and at stores. Once you take up an eye check-up and prescribed with a power lens then it is necessary to wear it. You may not feel comfortable wearing power glasses as they will not look cool on you. At such circumstances, you can just buy the stylish sunglasses with the prescribed power.
In early days, lenses are made using the glass. The solid piece of glass is well curved and cropped at required thickness. The thickness would vary as per the need of the power prescribed by the ophthalmologist. These optical glasses were difficult to use as they have to be handled with more care. If they are dropped once, it will break or crack. We need to replace the lens or the entire specs. It is waste of money. Then they invented plastic materials for making power glasses. Later, fibre glasses were invented and they are drop resistant. It is durable and people felt comfortable. Hence started using it supplementary.
New trendy glasses in the market is prescription sunglasses. The main difference between any specs and prescription sunglasses is that they prevent your eyes from sun and glare. You will be able to clearly see everything. The prescription sunglass lenses are available for almost every type of prescribed eye sight correction. Even you will be able to buy get bifocal lenses in these sunglasses. At the same time, you can get any brand sunglass to look more stunning. You can select the specific brand of sunglass that you want with the specific power. Some of the stores even let you to check whether corrective prescriptions are right. If you are an outsider then it is sure that you can use sunglass instead of other power glasses.