Nearsightedness is a condition which affects the vision of a person. This condition mainly appears due to some defect in the eyes. Due to this condition it becomes very difficult for a person to focus on objects which are placed far away from the person. The objects placed at a distance appear to have a blurred, dull shape and it is not only difficult but nearly impossible to make out their sharp features. There are various reasons behind the cause of nearsightedness also known myopia in humans. The eyeball of the person may be too long or the cornea can be too steep making it difficult for the person to see an object at a distance. In all its features and reasons etc, nearsightedness or myopia is the total opposite of far sightedness or hyperopia.
The solution to rid oneself of myopia is extremely easy. All one has to do is visit an optician or ophthalmologist and after a careful eye examination, make regular use of a corrective lens in order to nullify this condition.
People can also use contact lenses if they do not like the idea of prescription spectacles or even opt for refractive surgery for a more permanent solution. The corrective lenses used to rectify myopia have negative optical power. This means that the lenses used to cure myopia are concave whereas the lenses used to cure hyperopia are convex. The concave lenses bring about a balance as it negates the presence of excess positive diopters.
Many people talk about various ways in which one can prevent an occurrence of myopia in both adults and children. Some depend on studies carried out by certified professionals while others rely on mere guess work. However, certain studies have proven that constant exposure to a television set or a computer screen can lead to myopia and other sight related problems.
Many of the screens used now- a- days are efficient enough for this to not happen but constant exposure does have a negative effect on the eyes. Keeping a sufficient distance between the display screens and books that are read is also very important. Sometimes certain books have really fine print and this puts a lot of pressure on the eyes. It becomes a habit to read these books while holding them real close to the face. Habits like these can set off myopia in adults as well as children.
Reading or staring at a display screen of any sort for a long time in inadequate light also puts a lot of strain on the eyes. The muscles in the eyes including the retina and the cornea etc put a lot of effort in doing a job which would require a less amount of effort in adequate light. Adequate exposure to natural daylight is also extremely important. Research has shown that exposure to sunlight means that the eyeball does not elongate easily which is one of the basic reasons behind myopia. Three to four hours of exposure is enough.