When you are going to buy prescription sunglasses, there are certain points that must be taken care of. Otherwise you may not find the sunglasses as efficient as you would have wanted them to be. Further, you may feel that these are not serving the basic purpose for which you had bought them. Since these are bought to aid the vision, you must know certain terms associated with the prescription sunglasses such as focal length of the lens, and various length shapes and their significance.
Focal length: Focal length of a lens is the distance at which it focuses the rays obtained from any object. Due to various reasons, the lens of the eye stops functioning properly. This results in focusing of the rays from outside either behind or in front of the retina. Depending on where the rays have been focused by the eye lens, this problem is either called long sightedness or short sightedness.
When an eye specialist checks your eyes, he or she would specify the power of the lens which would help the eyes to focus exactly on the retina which removes any blurring of the vision. Do check out with the eye specialist, what is the power of the lens which has been given to you. Higher power indicates more serious problem with the eye lens.
Frame: The frame of the sunglasses helps in maintenance of the lenses in proper place and protects the lenses from any kind of damage. While choosing the frame, you should take care that the frame is properly aligned with respect to your face and it fits comfortably. Earlier, the frames used to be heavy and uncomfortable. With the advancement of technology, light weight frames were developed which were comfortable and fit on the face of the wearer very easily.
These days, frames are available in various shapes, styles and colors. You can choose such a frame which suits your personality, your face and complexion. Further, these are designed in such a way that these fit comfortably on the face of the person who wears them. Certain frames are available which can be suitable for general use or some specific activities such as biking or skiing or for sports such as basketball, swimming or football etc. There are certain frames which are suitable for those who like to read a lot. You can choose the frame on the basis of your requirements.
Lens: Lens is an important part of the sunglasses. It helps the eye lens to focus on the retina and hence provide us a clear vision. You can choose a simple or bifocal lens. Lenses of certain types have some advanced features such as protection from UV rays, cutting down the reflected rays etc. These help in removing the glare from various sources such as sun, water or computer screen. The tint density specifies how much protection is provided by the lens from the sun and is measured in terms of percentage of light which is blocked by these lenses.
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