Doctor insights on:
Do Diopters Measure Nearsightedness
Yes: Nearsighted eyeglass (or contact) correction will be denoted on the prescription as a (-) power and a number (e.g. -2.75) which would be a nearsighted person with a power of minus 2.75 diopters. ...Read more
How can I identify whether I have axial or pseudo-myopia? Is pseudo-myopia is restricted upto some power(diopter)?
Eye exam will tell.: Axial myopia: eye length is too long for distance light rays to be focused on retina. Other common cause of this is a cornea that is too curved + over focuses the rays short of the retina. Pseudo myopia likely refers to a spasm of the inner lens over focusing the rays - detectable with drops that paralyze focusing muscle. No limit to level of myopia. ...Read moreSee 1 more doctor answer
Myopia: Nearsightedness or myopia is very common. It is not uncommon for us to see patients who are -10 diopters or more. Be sure you have a dilated retinal exam every year and you know what retinal detachment signs look like (burst of black floaters, flashing lights, new floaters, curtain coming down over your vision); consider polycarbonate glasses for protection especially during sports. ...Read moreSee 1 more doctor answer
How to stop the progression of myopia? I'm 28 years old, male, office work, -7 diopters with astigmatism
Any risk in a myopic pregnant woman (-8 diopters) getting retinal detachment from pushing during delivery?
20 feet: All lanes are corrected for distance to be equivalent to 20 feet which is the defined standard. In metric countries it is 6 meters. The snellen fraction 20/ over something, uses the 20 foot standard as part of the fraction. It is arbitrary but since a universal standard was needed for the optical industry, in the usa 20 feet is adopted for all to measure by. ...Read more
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