How To Convert Glasses Prescription To Contact Lens

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Vertex distance convsersion chart for converting eyeglass prescription to contact lens

How to convert glasses prescription to contact lens. It is not a substitute for a professional contact lens fitting by. It's very simple to do. It is not a replacement for a professional contact lens fitting by a.

The fastest way to convert a glasses prescription to contact lenses is simply to look it up on a chart. Use our spectacle conversion calculator* to convert a patient’s eyeglasses prescription to the corresponding contact lens parameters. Equally, you cannot convert a contact lens prescription to a glasses prescription.

So a gp lens power will typically be close to the spherical correction of the glasses prescription. A contact lens prescription may also include an axis and cylinder if it is a toric lens for astigmatism, or an add if it is a multifocal lens, these are the only two measurements that can be found on both contact lenses and glasses prescriptions. The converted sphere power becomes the contact lens sphere power.

This is because many years ago the instruments used to measure and cut. Eyeglass prescription positive cylinder conversion ophthalmologists and a few older optometrists (different types of eye doctors), write astigmatism prescriptions with positive (+) cylinders. Contact lenses sit on the tear film of your eye so they are much closer than glasses that are approximately 12mm away from your eyes, this means that you normally need weaker power of contact lens than you do glasses, this is particularly true if you have a.

Measure the pd (pupil distance). Hold a ruler in front of the person to be measured and have them look straight ahead. There are two possible outcomes.

* the calculator is designed to aid eye care practitioners. Convert the glasses ‘sphere’ number using a vertex conversion chart. However, this will depend on the curvature of the back surface of the contact lens and the amount of spherical correction for myopia or hyperopia.

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