Vision Test Numbers Meaning

The bottom number is the distance at which a person with normal eyesight can read the same line.

Vision test numbers meaning. The number 90 corresponds to the vertical meridian of the eye and the number 180 corresponds to the horizontal meridian. Most printed material is at this level. If youve always wondered what all those vision test chart results actually mean when you have your eyes tested read on. The axis is defined with a number from 1 to 180.

Va as it is sometimes referred to by optical professionals is tested by requiring the person whose vision is being tested to identify so called optotypes stylized letters landolt rings pediatric symbols symbols for the illiterate standardized cyrillic letters in the golovinsivtsev table or other. Eye test prescriptions explained. 2020 vision is referred to as the standard or how a normal person sees. 20200 legal blindness.

For example if you have 2030 vision it means your vision is worse than average. News headlines are this size. 2080 able to read alarm clock at 10 feet. This means that when you stand 20 feet away from an eye chart you see what the normal person should see.

When the clear outer layer of the eye is irregularly shaped the condition is called astigmatism 2a perfect cornea is baseball shaped but most corneas tend to be more football shaped according to the national eye institute 2. For example if your prescription says 100 you have one diopter of nearsightednessthis is a fairly mild amount of nearsightednessif you are 425 that means you have 4 and 14 diopters of. Able to see. Visual acuity is a measure of the spatial resolution of the visual processing system.

2040 able to pass drivers license test in all 50 states. If an eyeglass prescription includes cylinder power it also must include an axis value which follows the cyl power and is preceded by an x when written freehand. Required to read the stock quotes in the newspaper or numbers in the telephone book. All this information is critical to any optician understanding your specific eye care needs but when you know the lingo it can also help you understand what you.

To the right is a brief description of what the numbers and letters on your optical prescription mean to help you understand your optical prescription. The eye practice has put together a short guide to understanding short sightedness long sightedness and astigmatism from the numbers on your glasses prescription. Cylinder numbers in a prescription represent the amount of astigmatism. The top number is your distance in feet from the chart.