My contact lens prescription is -7.5 in both eyes. How can you convert this into the 20/20 type number?
2006-07-06 11:12:04 · 4 answers · asked by Emma 1 in Health ➔ General Health Care ➔ Other - General Health Care
Unfortunately there is not conversion factor for the two, since seeing 20/20 is subjective and differs from person to person. But there are estimates - for a prescription as high as yours the highest letter on the chart (the big E) is probably unreadable - this means that your vision is worse than 20/400 or >20/400. Hope this helps!
2006-07-11 14:26:55 · answer #1 · answered by eyegirl 6 · 1⤊ 0⤋
There is no way to convert that power to a visual acuity measurement. I presume you mean your vision without contacts. Those two things are complete different measurements. Your visual acuity with a refractive error like that is only measurable to some extent by counting fingers held up in front of your face. Without glasses or contacts on you would probably be less than 20/2000....which doesn't even make sense anymore. Your vision WITH contacts on is the important measurement , and you are probably 20/20 or close to it. Don't be concerned about how bad your vision is without correction , it's how well you see WITH correction that counts.
2016-03-27 06:59:24 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Your vision will get better with a combination of glyco and phyto
nutrients.
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2006-07-16 02:53:24 · answer #3 · answered by Anonymous · 0⤊ 0⤋
laser surgery
2006-07-13 16:33:27 · answer #4 · answered by GN 2 · 0⤊ 0⤋