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Contact lenses are any medical device that are prescribed based on individual needs. Your doctor find out the power and fit of the lenses based on your vision correction and shape of your vision. Equipment used with eye doctors contain the Snellen Chart and phoropter for visual acuity and distance correction and a keratometer to determine the curves of your cornea. These assist him determine your contact prescription also are penned since any series of different numbers.

Difficulty: Moderate

Directions

Things You'll Want

Copy regarding your contact lens prescription

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

2 Reveal the energy of your contact lens. This may be written as power or pwr.

3 Interpret the Snellen Chart, the test the doctor gives you with the letters on the wall. 20/20 vision means that you may read some specific size print when you are 20 feet away. If you measure at 20/40, that means at 20 feet out of the chart you may read letters that some individual with 20/20 vision could read from 40 feet apart.

5 Disregard other numbers on the prescription, similar as base curve (B.C.) or diameter (dia.) as they are used to determine the meet about the lens, never your distance correction.

Tips & Warnings

Snellen vision is only exclusive estimate plus can differ in relation to individual prescriptions. Other components impact actual visual acuity, including astigmatism and other vision problems.

References

Undertanding Your Contact Lens Prescription The way in which Visible Acuity remains Measured

Snellen Chart

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