Usually youll see these abbreviations along the left side. Sphere power is the main strength of your eyeglass prescription and it is written in increments of 025.

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The distance prescription is self-explanatory.

How to read glasses prescription. Look for a series of numbers on the inside of your glasses. This eye needs a cylinder of -075 and an axis of 173 to correct astigmatism and an ADD power of 225 to correct near vision. This is short for oculus sinister and is your left eye.

You will need a distance prescription sphere power and an add. A shows that you find it hard to see things that are far away without glasses. Sometimes opticians write DS in the CYL column.

Lens power is measured in diopters D. A in the box indicates that you are long-sighted which means you find it difficult to see things close to you. The higher the number the stronger the prescription lenses required.

Trifocals sometimes called lined trifocals contain three prescriptions within one lens. The type of Rx glasses may be noted on a prescription such as DV Distance Visionnearsightedness and NV Near Visionreading. To successfully convert your eyeglass prescription to reading glasses you will need several other metrics.

The measurements should be printed in a small font on the inside of the temple the bridge or the earpiece. Cylinder power always follows the sphere power in an eyeglass prescription. If youre near-sighted or far-sighted check the SPH column to find out how strong your lenses need to be.

OD Oculus Dexter Latin abbreviation - means the right eye. To enter this youll need to use the My prescription is more complex than this link to show the more advanced prescription area. Look below to learn more about your SPH CYL Axis Prism PD and more.

The first step to understanding your eyeglass prescription is knowing what OD and OS mean. The higher the number the stronger the prescription lenses required. OS Oculus sinister - means the left eye.

To be easily interpreted worldwide eyeglass prescriptions are written in a standardized format with common notations. The number might be very small like 025 or a large number like 600. How do I read my glasses prescription.

It is defined with a number from 1 to 180. To read an eyeglass prescription look for the labels OD and OS which stand for right eye and left eye respectively. The add stands for the additional correction that is used for reading glasses.

Stands for oculus sinister meaning left eye. Your eyeglass prescription is typically written in a grid like the one below using a combination of terms abbreviations and numbers. The higher the prescription the greater the curve of the lens needed.

For multi-focal glasses as well as reading and computer glasses your Rx will include an ADD or NV value. With prescription in hand lets get your glasses. A shows that you find it hard to see things that are far away without glasses.

Now you know the ABCs and the ODs and OSs of your eyeglass prescription so you can make sense of your eyeglass prescription. The ADD value is usually present in a multifocal prescription. We know these as the instructions for making your glasses but what do they actually mean.

AXIS describes the degree and direction of your astigmatism. Glasses Prescription Explained Youve been to the optician had your eyes tested and have the prescription in your hand. This number always has a sign.

Just like with bifocals you can visibly see the lines between the prescriptions on the lens. The top prescription corrects distance vision the middle corrects intermediate distances 18 to 24 inches and the bottom corrects up-close vision. Usually the further away you get from the zero on either the plus or minus side the stronger your prescription is.

If an eyeglass prescription includes cylinder power it also must include an axis value which follows the cyl power and is written after x when written freehand. This simply means there is no astigmatism and you can enter either nothing leave the field blank or select the phrase DS in the drop down. A minus sign you find next to the number means nearsightedness and a plus sign is a farsightedness which means you might need a reading glass.

Additionally read the CYL column to find the strength of lens you need to correct astigmatism. Right and Left Eye. The number might be very small like 025 or a large number like 600.

In the sample below the right eye is prescribed -250 sphere to correct nearsighted vision. Find an eyewear shop nearby or online to pick your lenses and frames. This is short for oculus dexter and is your right eye.

Note that most people have prescriptions unlike the example shown above and usually have numbers similar in power for both eyes. This can influence your choice of frames. How to Read Your Eyeglass Prescription When you look at your prescription for eyeglasses you will see numbers listed under the headings of OS and OD.

In a typical prescription like the one above youll find these abbreviations on the left side. So the prescription for reading glasses for the right eye would be -025 050 x 180. Your glasses manufacturer may also group in extra information with the measurements such as words and or symbols but you only need the 3 main numbers to determine your size.

They are Latin abbreviations. They are abbreviations for oculus dexter and oculus sinister which are Latin terms for right eye and left eye Your eyeglass prescription also may have a column labeled OU. Stands for oculus dexter meaning right eye.

You are entitled to a copy of it once youve had your test and should be given a copy without having to ask nor should the optician imply that you have to buy your glasses from them. For the left eye the calculation is 175 100 275 DS. Page updated April 2018.

Heres a quick summary.

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