20 20 Eyesight--How Perfect Is Your Vision?
Is 20 20 Eyesight perfect? When defined by an optician, it means that you can see a size twenty font letter from a twenty-foot distance. These measurements have been the long-standing gauges that are used in defining a person's visual abilities. The numbers are easy enough to decipher and I will show you how.
The distance marker is listed first. During an exam, you will stand twenty feet away from the chart, and the optician will determine how well you read different sizes of font letters. If you can read the smallest size, a size "twenty" letter, then you are said to have perfect vision.
Everyone does not have perfect vision, however, and there are many other diagnoses made every day. Vision measurements such as 20/10 or 20/50 mean almost the same thing. The only change in the definition is the last number, the size of the font letter. Sometimes other issues affect your visual clarity such as stigmatisms, and that will affect your score also.
The symptoms of underlying vision problems can range from optical nerve pressure to sinus pressure due to a cold. These can cause various degrees of vision deficiency. The discomfort that your eyes feel after a long period of focused use is not measured in the distance/font score either. Your yearly checkup will evaluate these problems and can be corrected or treated by your optician.
There is a misconception that color blindness is due to regular eye problems as well. This is a false belief and being color blind is due to damaged rods in the eyes. Also, a person's color blindness does not affect their depth perception or the visual acuity of their lens.
While perfect vision is the goal, don't be discouraged if yours is not. The progressive nature of the optical world has nurtured great tools such as corrective lenses, Lasik surgery and glasses that give almost everyone a chance to see the world in true form. If you are wondering about the health of your eyes, call your optician and make an appointment for an evaluation.