Home Doctor Tips To Read The Eyeglass Prescription Given By Your Optician

Tips To Read The Eyeglass Prescription Given By Your Optician

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Whenever you go for an eye checkup and the optician provides you with a prescription for the eyeglass, it must be confusing to read the prescription and what the optician has written on it. All the numbers mentioned in it would seem like a puzzle to a common man.

While finding a best eye doctor around you, You can take help of Google by searching “eye care near me” to get a list of all available doctors near you and you can choose one of them by reading their reviews, For same here are certain tips in which you can easily read and interpret these numbers and the digits written by the optician so that you are no more confused when you visit an eye care near you.

OS and OD

The terms OS and OD are the abbreviations used for oculus sinister and oculus dexter. Both these are the Latin terms used for left eye and right eye respectively. In the prescription provided to you by the optician, the information about your eyes is written separately with the terms OS and OD in front of them. These signify the problems with your left eye and right eye respectively.

Sphere (SPH)

This is a representation of the power of the lens. It is measured in the unit of dioptre. The sign of – behind the number indicates that the person is nearsighted and the sign of + behind it indicates that the person is far sighted.

Cylinder (CYL)

The cylindrical power of the lens is an indication of the astigmatism power of the lens. A minus sign behind the astigmatism number indicates that the person has a problem in nearsighted astigmatism and a plus sign before it indicates that the person has a far-sighted astigmatism.


This term is used to refer the lens that has zero-cylinder power used to correct astigmatism. It is based on an axis which has 180 divisions. The 90th division refers to the vertical meridian whereas, the 180th division refers to horizontal meridian of the eye. An axis value is always followed after the cylindrical power of the lens.


This is the value used for reading the eye alignment of the eye. It is always measured in units p.d., which means prism dioptres. These are indicated in the fractional English units or the metric units and also refers to the prism direction showing the relative position of its base.


The confusion regarding reading of the prescription given by an optician can be a headache, but after reading this article, one will get a basic idea about the readings and will be able to interpret the prescription given by the optician.

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