If you happen to see the letters ADD, this is how much more power you need if you are getting bifocals or progressive lenses. CYL- This is short for cylinder. If you see this, this indicates astigmatism. This is a condition where the cornea is irregularly shaped and causes blurred or distorted vision. It also tells the lens strength needed to fix it. ADD- This is the added magnifying power you need in the lower part of a multi-focal lens.
There will be a number included on your prescription for each aspect of your vision that needs to be corrected. The further from zero that the numbers are, the more correction you need. However, your prescription for eyeglasses contains numbers and abbreviated words that you may not be able to understand. Therefore, the first step towards reading your eyeglass prescription is to understand the meaning of these abbreviations.
Traditionally, the abbreviations used have been derived from Latin terms to describe information pertaining to your right and left eye. Below is a list of the most common abbreviations found on eyeglass prescriptions to help explain what they mean.
They are Latin words that mean right eye and left eye respectively. OU refers to Oculus Uterque. It stands for both eyes. These are the traditional abbreviations that doctors use when making prescriptions for eyeglasses.
However, some eye doctors prefer to use modernized prescriptions. Re stands for right eye while E stands for the left eye. The abbreviation SPH stands for Sphere. It describes the amount of lens measured in diopters that you need for good vision. The term means that the correction for your sight is spherical.
If you are shortsighted, the number under the abbreviation will include a - sign. If your prescription has the word Plano, PI, or an infinity sign, it means that you do not have distance problems.
You may, however, have astigmatism. Most values will be 0. Axis is the lens meridian that has no cylinder power to correct astigmatism. The axis number helps your eye care provider to know the direction in which they should position a cylindrical power in the lenses of your glass.
The number may be between 1 to , where 90 represents the vertical position while represents the horizontal position. The numbers only describe the position of astigmatism, they do not explain the strength of your prescription. The Axis can be present if there is a CYL value. The abbreviation stands for Cylinder. It represents the amount of lens power you need for astigmatism. A contact lens prescription specifies the lens diameter, the back surface contact lens curve, and often the manufacturer or lens brand that specializes in specific vision conditions.
The average PD of an adult is anywhere between mm, and between mm for kids. An ophthalmologist will usually measure your pupillary distance during a regular exam. If you have any questions when measuring your pupillary distance, you can always reach out directly to our Customer Experience Team at [email protected]. In case you have no vision problems, you can get checked every five years until you reach the age of After turning 30, the exams should come every years.
After the age of 65, everyone needs regular eye exams at least once every two years. At Felix Gray, we carry a wide selection of Blue Light blocking prescription glasses and sunglasses.
Shop now for top-notch fits and find your ideal pair. Understanding the acronyms on your prescription If you want to learn how to read prescriptions for glasses, you must start with decoding the acronyms and abbreviations commonly found in them. An eye prescription chart may include several numbers and abbreviations, including: O.
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