How To Convert Eyeglass Prescription To Contact Lens
In contact lenses, the ‘axis’ is generally only available in 10° steps.
How to convert eyeglass prescription to contact lens. We can also convert an eyeglass prescription into a contact lens prescription but not the other way around. Use our spectacle conversion calculator* to convert a patient’s prescription for glasses to the corresponding contact lens parameters. Measure the pd (pupil distance).
* the calculator is designed to aid eye care practitioners. The conversion will affect (change) the sph, cyl, and ax parameters in your prescription, but will result in the exact same vision correction you were fit for by your doctor. Take into account the different position of a contact lens 1.
A typical prescription would look like this: Your glasses sit several millimeters away from your eye, while a contact lens (placed directly onto your eye) will be slightly weaker 1. Hold a ruler in front of the person to be measured and have them look straight ahead.
That means that eye doctors have to determine which axis is going to give you the best vision in the contacts. * the calculator is designed to help eye care practitioners. Here’s how you convert contact lenses to glasses:
Convert your eyeglass power into contact lens power. Click here to see how to transpose an rx manually. You will need to have this prescription measured by an optometrist to get the exact power difference, as various factors will affect your prescription.
In an eyeglass prescription, the ‘axis’ number can be any number from 1° to 180°. A contact lens prescription will include these two very important measurements. However, the eyeglass prescription can be used in the construction of the contact lens prescription, by making allowances for the change in distance between the corrective material and the optic lens.
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