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Doctor insights on: Do Diopters Measure Nearsightedness

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Do diopters measure nearsightedness?

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

Diopter (Definition)

The diopter is a term used in optics to measure the ability of a lens or mirror to bend light (one diopter is the displacement of one cm at a distance of one meter). Eyeglasses and mirrors are measured in this unit. It is not the snellen fraction (20/20 ...Read more


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What diopter goggles should I get if nearsighted?

What diopter goggles should I get if nearsighted?

Same as glasses: If you know you are nearsighted, you probably have a prescription for eyeglasses. Goggles will be made for you of the same approximate power. ...Read more

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How can I identify whether I have axial or pseudo-myopia? Is pseudo-myopia is restricted upto some power(diopter)?

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 more

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How severe is -3 diopter astigmatism and -8 diopter myopia?

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 more

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How to stop the progression of myopia? I'm 28 years old, male, office work, -7 diopters with astigmatism

Little needed: At your age, myopia has run its course and there is little likelihood of further changes. You might be a good candidate for lasik as things have stabilized and the results should be good. ...Read more

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Any risk in a myopic pregnant woman (-8 diopters) getting retinal detachment from pushing during delivery?

No: Although the risk of retinal detachment may be somewhat higher in a high myope (near-sighted person), I do not believe that delivery poses much of an increased risk. Enjoy the baby! ...Read more

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What is the distance to measure nearsightedness at, and why?

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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Can you guys tell me how big a deal is -0.5 diopters to mis-measure?

Can you guys tell me how big a deal is -0.5 diopters to mis-measure?

Minor: This is easily within the range that your eye can adjust to it and measurement of optical strength can include at + or - factor of 0.5 easily since the measurement is subjective. So it is not a big deal. ...Read more

Dr. Tim Conrad
269 doctors shared insights

Holding Objects Closer To Read (Definition)

Nearsightedness is a symptom where a person has trouble seeing clearing faraway objects. ...Read more