What are the letters on an eye chart?
Only the nine letters C, D, E, F, L, O, P, T, Z are used in the common Snellen chart.Click to see full answer. People also ask, what size are the letters on an eye chart? Using a Snellen Eye Chart So if, at 20 feet, you can read the letters on the row marked…
Only the nine letters C, D, E, F, L, O, P, T, Z are used in the common Snellen chart.Click to see full answer. People also ask, what size are the letters on an eye chart? Using a Snellen Eye Chart So if, at 20 feet, you can read the letters on the row marked “40,” this means you have visual acuity of 20/40 or better: 1/2 normal. From 10 feet, if the smallest letters you could read were on the “40” line, this would give you an acuity of 10/40: 1/4 normal.Secondly, what does the eye chart mean? An eye chart measures visual acuity, which is the clearness or sharpness of vision. The top number is your distance in feet from the chart. The bottom number is the distance at which a person with normal eyesight can read the same line. For example, if you have 20/30 vision, it means your vision is worse than average. Simply so, are all the eye charts the same? Most charts now are digital and randomized. The letters used are still the same pool of letters. The font is still the same. Most eye charts are a variation of the Snellen Chart.How do you score a Snellen eye chart?To interpret your reading, think of the numbers in feet. For instance, someone with 20/60 vision can read at 20 feet away what a person with normal vision could read at 60 feet away. Modern optometric exam rooms are equipped with electronic eye reading charts, making it easier to produce accurate readings.
