As far as vision is concerned, what is a prescription of -3.00 equal to in 20 terms?

Kainantu

Can't be done. Apples and oranges. The 20 in 20/20 vision is 6 metres. -3.00 is a diopter reading. In this case it is myopia. Myopia is a visual defect in which distant objects appear blurred because their images are focused in front of the retina rather than on {it;} nearsightedness. Also called short sight A diopter is a unit of measurement that indicates the amount of correction needed to change your vision to as close to 20/20 as possible. The numbers on your eyeglass prescription are diopters, and they indicate the type and power of lens needed to achieve normal vision . A numeral preceded by + (for hyperopia) or - (for myopia). Nearly 85% of nearsighted individuals are in the range of -1.50 to -7.00 diopters, which is considered mild to moderate. Moderately short sighted = (-1.00 to %963.00 dioptres) ( Extract:...the majority of whom will achieve 6/6 %96 commonly known as 20/20 vision.) NOTE: Diopters CANNOT be mapped into visual acuity in ANY meaningful way no more than apples equate to oranges. 20/XX is a method that seeks to give a quantification to the resolving power of the eye with respect to standardized letter sizes. This method, adopted 125 years ago, is quite simple. 20/20 means that the tested eye can discern a specific sized letter at 20 feet ( 6 meters) - this is considered the norm. 20/40 means that the tested eye can discern a letter of a size at 20 feet that a 'normal' eye can discern at 40 feet, Conversely, 20/15 denotes superior sight because it indicates the eye can recognize a test letter from 20 feet away that an average eye cannot recognize from farther than 15 feet . Dividing the numerator by the denominator gives you an idea of the visual efficiency of the eye. Thus a 20/40 eye has a 50% efficiency - sufficient to drive in a Nov 16 02, 1:13 AM

Kainantu

Being a little bit verbose anain... Conversely, 20/15 denotes superior sight because it indicates the eye can recognize a test letter from 20 feet away that an average eye cannot recognize from farther than 15 feet . Dividing the numerator by the denominator gives you an idea of the visual efficiency of the eye. Thus a 20/40 eye has a 50% efficiency - sufficient to drive in all states, day or nite. http://www.myclearvision.com/FAQ http://www.marchon.com/Prof.%20Courses/Optics%20of%20Light/Course1.html http://www.bootsopticianslasik.co.uk/questions.html There may be some errors in this K : ) Nov 16 02, 2:03 AM

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