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Contact lenses are some medical device that is are prescribed based on individual needs. Your doctor determines the power plus suit of the lenses based on your vision correction also form of your eye. Apparatus used through vision doctors include the Snellen Chart and phoropter for visible acuity and range correction also a keratometer to see the curves regarding your cornea. These support him determine your contact prescription and are penned as a series of different numbers.

Difficulty: Moderate


Things You'll Need

Duplicate of your contact lens prescription

1 Read the prescription to determine right and left eye. OD is right vision and OS is left vision.

2 Find the power regarding your contact lens. This may be penned like strength or pwr.

3 Interpret the Snellen Chart, the test the doctor gives you with the letters on the wall. 2 website/2 internet site vision means that you may read a particular size print whenever you are 2 internet site feet aside. If you method in 2 website/4 website, that means in 2 website feet from the chart you can read letters that a person with 2 website/2 internet site vision could read from 4 internet site feet apart.

4 Specify the power about the lens as related to the Snellen Chart. 2 web site/4 website Snellen remains approximately any strength of 1. web site website, 2 web site/6 internet site to 2 website/1 website website may be power of 1.5 website to 2. website website, and 2 website/2 website website averages greater than 2. website website strength.

5 Disregard other numbers on the prescription, such as base curve (B.C.) or diameter (dia.) whereas they are applied to ascertain the fit of the lens, not your range correction.

Snellen vision is only an guess also can differ within relation to individual prescriptions. Other factors influence actual visual acuity, including astigmatism and other vision problems.


Undertanding Your Contact Lens Prescription How Visual Acuity is Measured


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Topic revision: r1 - 03 Nov 2011 - 08:07:53 - SarahManley4
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