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Find out the way in which much strength you need from your contact lens by way of using math.

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Most people know that 2 website/2 website vision is any excellent eye grade, but few people know how this score relates to the strength of contact lenses. The transformation of visual acuity to the corrective strength about a lens entails basic math. Vision scores are penned as 2 web site/2 website or 2 website/6 internet site, whilst contact lens energy are written on diopters because + website.25, or -1. website website. In regard to 1/4 diopter, which is the method regarding where a lens focuses light, is added to a lens' strength for every increment of 1 web site that the denominator of your visual acuity is over 2 web site.

Difficulty: Tolerably Easy

Instructions

1 Get outside what your visual acuity score yous for every eye. You can do this by seeing an optometrist, or by trying to read the visible acuity chart by home.

2 Subtract the numerator of your visual acuity score from the denominator about the visual acuity score of one of your visions. Write lower the result of this subtraction.

4 Multiply 1/4 by the amount that is you found in the previous action.

5 Repeat the conversion course of action, this time using your visual acuity score with your other eye.

Tips & Warnings

If your visible acuity is given to you because some negative number (like seeing that -2 website/3 website) later your lens strength in diopters will be positive. Also if your visual acuity is acknowledged to you seeing that a positive number (like as 2 website/3 website) therefore your lens energy in diopters will be negative. If you get hold of a zero whenever you subtract the numerator about your visual acuity score from the denominator of your visible acuity score, later your lens strength in diopters will be zero. This method of converting visible acuity to lens strength yous an approximation. This conversion method should not be used from the location of some professional diagnosis.

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References

Focusers; Explanation regarding Diopter Power; 2 website11 Macular Degeneration Service; How Visible Acuity remains Measured; Wendy Strouse Watt; October 2 website website3 Perret Opticians; Eye Chart; 2 website website8

Resources

Photo Credit Jupiterimages/Goodshoot/Getty Images ;

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Topic revision: r1 - 26 Dec 2011 - 11:27:03 - GracieHuber2
 
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