Eyesight plays a very important role in the life of human beings. The conditions regarding vision which afflict many people around the world are not permanent and could be overcome through various means. Most of the conditions are really easy to treat like hyperopia or myopia for example. These conditions are also known as far sightedness and near sightedness respectively. The optician or the opthamologist performs an eye exam which is a group of tests to evaluate the power of the eye. Based on the results of this test the opthamologist or the optician prescribes a lens which will make up for any deficiencies or discrepancies in the eye.
The right number and the right kind of lens can work wonders for the eyes as it would enable the person suffering from any of the above mentioned conditions to enjoy a clearer and crisper picture. The intricacies of the objects which were blurred before become clearer after using a proper lens. Getting the lens wrong could lead to more trouble. For example, if a concave lens is used instead of convex it will just aggravate the problem.
Even the power of the lens makes a huge difference. If a less powerful lens is prescribed then what is actually necessary than the object would still appear to be blurred and it would still be difficult for the person to properly distinguish any shapes. If an extra powerful lens is used, one which is more powerful than actually necessary then it puts a lot of stress on the eyes which again is not a good thing at all. It is absolutely essential to get the power and the type of lens needed to rectify the vision of a person correct. A wrong prescription can also lead to health problems like constant headaches etc.
People also need different types of lenses according to many environmental factors as well. For example people suffering from a visual defect like myopia or hyperopia still have to work in front of computer screens and hence it is important for them to choose lens which come with anti glare coating. Some people need glasses only while reading and this is observed in people who have crossed the age of 45 years. With increasing age the vision degenerates and thus the lenses needed by this group are different.
There are many different kinds of lenses like bifocal lens, trifocal lens, occupational lens and it is extremely important to understand the purpose being played by the lenses and then choosing a specific type. This way one does not end up choosing and using a wrong type of lens which does not suit their needs.
Then there are lenses like polycarbonate lenses which are extremely tough and can withstand wear and tear. Such lenses are most suitable for kids as giving kids lenses made entirely of glass can prove to be a costly and hazardous affair. All in all, a right lens could lead to nullifying the problems regarding vision while the wrong ones can lead to more of them.