Contact lenses come in different sizes and must be fit to your eye by an optometrist or ophthalmologist. The best solution to get a contact lens prescription is to see an eye doctor/optometrist and get an eye exam that’s specifically for contact lenses.

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In addition to the power the proper base curve (bc) and diameter (dia) are needed to order contact lenses.

How do i convert my eyeglass prescription to contacts. When you get contacts, your eye doctor will do just a bit more than what is done for an eyeglasses prescriptions.that’s because there are measurements needed for contacts that are different from those of glasses. If you would like to order single vision glasses for far distance only, just simply leave off the add strength and use the bigger pd (distance pd) 64mm. The add stands for the additional correction that is used for reading glasses.

It’s important to tell your eye doctor you want to wear contact lenses so. If a contact lens seller tells you that they don't need to see your prescription. The doctor can give you a prescription for contact and a prescription for glasses.

Let's take an example of an eyeglass prescription: Can i use my glasses prescription for contact lenses? To read an eyeglass prescription, look for the labels o.d. and o.s., which stand for right eye and left eye respectively.

* the calculator is designed to aid eye care practitioners. How to get a contact lens prescription. Equally, you cannot convert a contact lens prescription to a glasses prescription.

Use our spectacle conversion calculator* to convert a patient’s eyeglasses prescription to the corresponding contact lens parameters. Draw 180° and 90° reference lines. Think of this cross as overlaying the lens of the glasses prescription you’re working with, like this:

As i know, there are about 8 spectacled people out of ten who have both prescription glasses and contact lenses. So the eyeglass prescription must account for that distance as well. Your glasses sit several millimeters away from your eye, while a contact lens (placed directly onto your eye) will be slightly weaker 1.

Thus, the glasses and contacts are manufactured based on diopter. You could convert a prescription for glasses in to one for contacts but the process surely is a little complicated. The axis on prescriptions for glasses can be any number between 1 and 180, however, in contact lenses, the axis can only be between 10 and 180 in steps of 10.

Source, 7 years working in an optical practice with 5 years as a contact lens. To successfully convert your eyeglass prescription to reading glasses, you will need several other metrics. The answer is often not obvious, although in the great majority of cases, they are not the same.

Yes of course it can be converted but legally we need a copy of your present (less than 2yrs old) eye glass prescription. You will need a distance prescription, sphere power, and an add. The amount of correction is expressed in diopters, sometimes abbreviated as d.

You will get a separate diopter value for each eye. Here we will draw two reference lines 180° and 90°. The power cross is the main tool used in visualizing and organizing the calculations involved in this conversion process.

Why do i need to convert to diopter? You can make an estimate for soft contact lenses, based on vertex distance calculations, but you cannot guarantee that a particular calculation or conversion will work exactly. Yes, you still need a prescription signed by your doctor in order to buy contact lenses.

When you’re buying glasses online, all you need to do is make sure the numbers on your prescription match the numbers in the prescription field on your screen. You can then have each made for you. The prescription is measured in diopters, the refractive power of your new glasses or contacts.

Sphere power is the main strength of your eyeglass prescription, and it is written in increments of 0.25. 4.00 d +0.25 d 6.00 d +0.50 d 8.00 d +0.75 d 10.00 d +1.00 d 12.00 d +1.25 d 14.00 d +1.50 d 16.00 d +1.75 d. A typical prescription would look like this:

It is not a replacement for a professional contact lens fitting by a qualified eye care practitioner. You need the cyl and axis numbers to get a full prescription. A contact lens prescription provides additional information about the size of the lens (not just information about the power.) and the power will also be different because, while a contact lens sits directly on the surface of the eye, eyeglasses sit about 12mm in front of it.

For the contact lens prescription, eye doctors will have to select the closest axis possible. In most cases, a contact lens prescription is less accurate than a glasses prescription, but it's good enough for contacts as the eye can kinda compensate, but it doesn't work like that for glasses. Here’s how you convert contact lenses to glasses:

You will need to have this prescription measured by an optometrist to get the exact power difference, as various factors will affect your prescription. Your eyeglass prescription only has the power part of the contact lens prescription. It's very simple to do.

Convert my eyeglass prescription into a 20/20 type measure.