An optometrist measures your visual acuity with the help of a chart of letters. Visual acuity refers to the clarity and sharpness of vision. Many optometrists use an improved chart to measure visual acuity now. The topmost rows have the biggest letters and the size of the letters keeps decreasing as you go down.Ī person with visual acuity 20/200 is termed as “legally blind” however different countries have different measurements to determine blindness. The 11 rows of letters are in decreasing order with respect to the sizes of these block letters. Snellen chart consists of 11 rows of letters that are used to measure visual acuity. These measurements are called, ‘visual acuity standard’ according to the Snellen chart, given by the ophthalmologist, Snellen. The only difference in 6/6 and 20/20 is in the unit of measurements. And a normal vision is 6/6 or 20/20, which means you can see at 6 meters what a normal person also sees at 6 meters, likewise 20/20 means you can see at 20 feet what a person with normal vision can see at 20 feet. What distance 6/12 vision means and how to cure it? What is 6/6 OR 20/20 vision?Īn optometrist measures vision at a standard distance of 6 meters or 20 ft.
0 kommentar(er)
