To assist us in our struggle to live a fast paced life, computers have the toll of choice. More and more hours are now being spent in front of the computer without taking the minimum breaks or the required amount of rest. Obviously, the eyesight is going to respond to this irresponsible use and there is increasing number of cases where computer users start feeling eye-strain and headaches. These symptoms are commonly known as the Computer Vision Syndrome (CVS) and if unchecked, it might lead to permanent visual disorders. An easy way to check the growth of CVS is to purchase computer glasses which are nothing but regular reading glasses and prescription glasses updated for computer usage. You can come across cheap glasses at the online stores and these online glasses cover a wide range of colours and designs. 
The main reason for the development of the CVS is the fact that the eyes and brain reacts differently to the words which appear on a computer screen than to the words which are printed on the paper. Excessive usage of computer leads to eyestrain, dry eyes (which lead to irritation) and headaches with a blurred vision. 
While deciding on the reading glasses or purchasing glasses to be purchased as computer glasses, you need to know that there are three kinds of glasses which have different sets of benefits. The single vision prescription glasses or reading glasses are the most common with the entire lens dedicated to seeing the computer monitor. As these cheap glasses are really simple to use, they are the favourite among all the age groups. These glasses have a disadvantage though: the objects which are situated closer or farther than the computer screen will appear hazy and blurred. There are reading glasses which are known as flat-top <a rel="nofollow" onclick="javascript:ga('send', 'pageview', '/outgoing/article_exit_link/3777820');" href="/links/?u=http://www.eyeexperts.co.uk/bifocal.htm">bifocals</a>, with the lenses divided into two halves by a clearly visible line. The top half of the lenses of these glasses online is used to look at the computer screen while the lower half is used to see objects which are nearer. Again, these prescription glasses are not suited to look at objects at a distance. Finally, there are <a rel="nofollow" onclick="javascript:ga('send', 'pageview', '/outgoing/article_exit_link/3777820');" href="/links/?u=http://www.eyeexperts.co.uk/">glasses online</a> which have lenses with variable focus. The advantage of these kinds of reading glasses and prescription glasses is that, you can use the top part of the lenses to view objects at a distance, the middle part while using the computer and the lowest part to see at objects which are located nearby.