While good eyesight may seem the same as good vision to most people, the terms eyesight and vision do have some differences. Basically, eyesight refers to the ability a person has to see clearly without any corrective lenses. This ability varies greatly from one person to the next, and can change considerably as time passes.
Vision is the ability to process what you see, and it can be improved with practice.
Eye doctors recommend that everyone should have their eyes checked at least every two years. An eye examination may show that a person has 20/20 eyesight, which means they are able to correctly perceive images at a distance of 20 feet without corrective lenses. The difference between eyesight and vision in this case is that while the eyes may see the images clearly, vision refers to how the images are translated by the brain.
Perfect vision requires both eyes to work in tandem in any circumstance, but differences in lighting and whether the object viewed is near or far away can affect each eye separately. Good vision requires both eyes to focus exactly alike in any situation, and this ability is referred to as accommodation.
Many people are blessed with good eyesight due to their genetic disposition. As time passes, the ability to see clearly diminishes for most people, and this change can also be due to genetics. It is more likely caused by one of more of the various outside influences that can damage the eyes and result in poor eyesight.
Overexposure to the UV rays of the sun can cause the eye to be permanently damaged, and the cumulative effect of ultraviolet radiation may cause such eye disorders as solar retinitis, macular degeneration and corneal dystrophies. Wearing sunglasses with polarized lenses to block out more than 99 percent of the harmful UVA and UVB rays and reduce glare is highly recommended.
Type 2 diabetes is becoming more common in recent years, and it causes blindness in adults more than any other factor. It is fortunate that eating a healthy diet can help prevent the incidence of type 2 diabetes in adults, and it can also help maintain good eyesight. Vitamin A is not only found in carrots, but also in eggs and liver. This nutrient, and others help to keep the eyes healthy and prevent obesity which often results in diabetes.
Fortunately, modern eye doctors are able to treat visual issues. The best course of treatment may be for the person to wear corrective lenses, either in the form of eye glasses or contact lenses. One form of vision correction that is becoming more popular and less expensive is Lasik surgery. In this procedure, the doctor uses a laser to reshape the corneal lens of the eye so eyesight is corrected without the necessity of wearing corrective lenses. This procedure often needs to be repeated within several years since the shape of the eye may continue to change. Another option that is gaining acceptance is Optometric Vision Therapy, a non-invasive, non-surgical treatment option that helps patients overcome issues through the use of specific techniques and optometric tools.
The difference between eyesight and vision may not be very obvious when a person develops cataracts. When cataracts develop, images become more and more blurry until they cannot be discerned at all. A cataract is a filmy growth that develops and eventually covers the cornea and pupil. Laser surgery is also used to correct this problem, but rather than reshape the lens, it is completely replaced with an artificial one. This type of surgery creates clear vision for the patient for a longer time period, and in many cases never needs to be repeated.
Most people understand how important it is to protect their eyes since their quality of life will be severely diminished if they lose their eyesight. Many eye diseases are age-related, so anyone with family history of diabetes or high blood pressure should be particularly diligent about having regular eye exams.
A healthy lifestyle with frequent exercise and good nutrition can reduce the risk of many age related health problems, including diseases of the eye. An eye doctor should be seen immediately if any changes such as blurry vision, double vision, eye pain, floaters and flashes of light are noticed. An early diagnosis of diseases that threaten sight can help prevent permanent loss of vision.
There is a difference between eyesight and vision. Vision is more than 20/20.