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Ultimate guide to reading eye prescription

Lensmart 2022-11-08 11:37:44

A telltale sign that you need eyeglasses is that you suffer from frequent headaches. Your doctor might recommend that you have your eyes tested. Other major reasons for an eye test are that you begin to have blurry vision and have to keep reading material at a distance.


Blurry vision is called refractive error and requires glasses. Your eye test will reveal whether you have one of the following refractive errors: nearsightedness, astigmatism, presbyopia, or farsightedness.


One of the absolute necessities for eyeglasses is your eye prescription. You cannot get a pair of eyeglasses if you do not have an eye test. In recent years, many optometrists have done separate eye tests or given you a package with the eye test included.


A separate eye prescription allows you to have the option of choosing frames from different outlets. However, you must note that in such cases, the eye test will come with a disclaimer. For that reason, it is important for you to know how to read eye prescription.


daily outfit with prescription glasses


What is an Eye Prescription?

An eye prescription is the result of your eye test. Some of the elements included in an eye test will provide information specifically for:

1. Prescription for your left eye – LE or OS (Left Eye)

2. Prescription for your right eye – RE or OD (Right Eye)

Most optometrists use OS and OD, but in recent times, some optometrists have opted for the English abbreviations LE and RE instead.

3. How the lens will refract light – SPH (Sphere of the eye)

4. If you have astigmatism it will include the correction number – CYL (Cylinder of the eye)

5. The units of measurement for the optical power of the lens are diopters: the. These are the measurement units used to determine the optical power of the lens.

6. The additional correction numbers needed for close focusing are the ADD measurements.


The optometrists have specialized equipment to do all the testing and measurements required to meet these requirements. These state-of-the-art testing facilities allow them to make further medical referrals if there are any problems that lenses cannot fix.


How to Read an Eye Prescription

You will find that getting a separate eye prescription will give you more options when choosing glasses. For this reason, you should know how to read eye prescription. In the previous section, we showed you some of the abbreviations that are used on the prescription.


By knowing what these are, you are able to read your prescription. Both eyes are tested separately, which will be recorded as OD or OS (right eye or left eye). Each of these is assigned a number for distance and ADD. Of specific importance is the number under SPH. Additional numbers are allocated under CYL, axis, prism, and base.


You can determine the weakness of your eyes by how far away from zero the number is on your prescription. The farther away, your eyesight will need more correction, which means a stronger prescription. If you are farsighted, the allocated number will have a plus sign. If you are nearsighted, the allocated number will have a minus sign. Included will also be the distance between the centers of the pupils, which is the pupillary distance (PD). See below for an example.


chart of eye prescription



Tips to Find the Right Glasses with Your Eye Prescription

Lensmart offers you a wide range of frames that will help you choose your lenses. One of the best ways to choose your glasses with your prescription is to choose a larger frame, such as Nors. The reason for this is that it will offer more comfort, especially if you have a prescription for multifocals.

Nors: Square Grey Eyeglasses


An excellent choice for your single vision prescription is to choose a smaller frame. Finley or other rectangle glasses are an excellent choice. How to find the right glasses for you is as follows:

1. First of all, know how to read your eye prescription. It will give you an advantage when choosing your glasses. It will help you choose the frame that is best for you.

2. Make sure you know your pupillary distance (PD) so that your lenses are fitted correctly.

3. Always keep in mind all the other elements that would help you find the right glasses. As with all glasses, choose the right ones for your face shape, skin color, and so forth.


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