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Contact lenses are some medical device that are prescribed based on individual needs. Your physician determines the energy also healthy of the lenses based on your vision correction and form of your eye. Gear used by eye doctors include the Snellen Chart and phoropter with visible acuity and distance correction plus a keratometer to define the curves of your cornea. These aid him determine your contact prescription and are written since a series of diverse numbers.

Difficulty: Moderate

Instructions

Things You'll Need

Copy of your contact lens prescription

1 Read the prescription to find out right plus left vision. OD yous correct eye and OS is left eye.

2 Uncover the strength of your contact lens. This might be written like strength or pwr.

3 Translate the Snellen Chart, the test the physician gives you with the letters on the wall. 2 web site/2 website vision means that you may read a particular dimension print while you are 2 web site feet apart. If you measure at 2 website/4 website, that means at 2 website feet from the chart you may read letters that is a person with 2 website/2 website vision could read away from 4 web site feet aside.

4 Find the energy of the lens as related to the Snellen Chart. 2 website/4 website Snellen is roughly any power of 1. website website, 2 web site/6 internet site to 2 website/1 website internet site can be power of 1.5 website to 2. website internet site, also 2 internet site/2 website website averages higher than 2. website web site power.

5 Disregard additional numbers on the prescription, such as base curve (B.C.) or diameter (dia.) as they are used to determine the suit regarding the lens, not your length correction.

Suggestions & Cautions

References

Undertanding Your Contact Lens Prescription The way Visual Acuity is Measured

Resources

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