How to Read an Eye Prescription: What the Numbers Mean

regular eye exams are an crucial separate of keeping your eyes healthy and your imagination sharp. At your eye examination, an eye doctor, optometrist, or ophthalmologist, will check for any signs of eye disease. If your vision needs to be corrected, you ’ ll be given a prescription for eyeglasses or touch lenses. eye prescriptions can be hard to decipher, though. They normally contain an categorization of numbers and letters that can be confusing if you don ’ thymine know what they mean. This article will help make sense of the abbreviations and numbers that may be included in your eye prescription. It will besides explain how prescriptions can vary depending on your sight emergence.

About eye prescription abbreviations

Your monocle or contact lens prescription will contain respective abbreviations, many of which will be followed by numbers. here ’ s a summary of what these abbreviations mean :

A glossary of eye prescription abbreviations

  • ADD stands for the additional lens power needed to make it easier for you to read. This number is seen on prescriptions for reading glasses or the lower portion of bifocal or progressive lenses.
  • Axis is a number between 1 and 180. It indicates exactly where the astigmatism appears on your eye.
  • BO, BI, BU, BD stand for base out, base in, base up, and base down. These abbreviations tell the eyeglass manufacturer exactly where to position the prism on eyeglasses that correct double vision.
  • CYL stands for cylinder, or the amount of astigmatism in your eye. The cylinder and axis together help correct astigmatism.
  • DV is an abbreviation for distance vision. This number indicates whether you have nearsightedness or farsightedness.
  • NV stands for near vision, or the amount of power that needs to be added to make reading easier.
  • OD means oculus dexter, or your right eye.
  • OU stands for oculus uterque, or both eyes.
  • OS is oculus sinister, or your left eye.
  • PD means pupillary distance. Monocular PD is the distance from your pupil to the middle of your nose. Binocular PD is the distance from one of your pupils to the other pupil.
  • Prism is used if you have double vision. It indicates the amount of prismatic power your glasses need to correct for differences in the alignment of your eyes.
  • SPH means sphere, or the power of the lens that will correct your eyesight.

What about the numbers?

many of the abbreviations on your prescription will be followed by numbers. If the numbers are marked with a plus sign ( + ) or no gestural, you ’ ra farsighted. If the numbers are marked with a minus augury ( – ), you ’ rhenium nearsighted. Some of the numbers in your prescription tell the monocle manufacturer how much correction your vision needs. Eyeglass strength is measured in diopters. If your prescription reads -1.00, that means your eyeglasses need 1 diopter of intensity to correct myopia. If your prescription reads +2.50, your eyeglasses need 2.5 diopters of potency to correct hyperopia. The higher the count, the more correction your sight needs.

What to know about nearsighted prescriptions

Nearsightedness, or myopia, is a common deflective disorderliness. If you ’ rhenium nearsighted, you can see objects that are close clearly, but objects that are farther aside will look bleary. With myopia, your eye is normally elongated, with besides much distance between the cornea at the front man of your eye and the retina at the bet on of your eye. Nearsightedness can besides happen if the cornea of your eye is excessively curved. due to this increased distance, light rays fall in front of your retina ( a light-sensitive structure that sends signals to your brain ) alternatively of on it. This can cause your outdistance vision to be fuzzy. The lenses in your eyeglasses will correct the bend in the light and aid you see distant objects more distinctly. For a nearsighted prescription, the force of the lenses will be marked with a subtraction signboard. The more nearsighted you are, the higher the numbers will be. For case, a lens prescription drug of -5.00 is a stronger prescription than -2.00. The strength of the lenses can vary for each eye.

What to know about farsighted prescriptions

Farsightedness, or hyperopia, is a refractive perturb that makes airless objects harder to see than distant objects. It happens because the distance from the cornea to the retina is besides short-change or because the cornea of your center is not curved adequate. If you ’ re farsighted, ignite focuses behind your retina rather of squarely on it. For a farseeing prescription, the forte of the lenses will be marked with a asset augury. The more farseeing you are, the higher the numbers will be. For case, a lens prescription of +4.50 is a stronger prescription drug than one that ’ south +2.00. Correcting your imagination with glasses or contact lenses, for both myopia and prevision, may besides help prevent :

  • headaches
  • eye strain
  • burning or stinging in your eyes

What to know about astigmatism prescriptions

Astigmatism is an irregular curve in either the lens or the cornea of your eye. This atypical swerve can bend the clean that enters your eye and affect the room it hits your retina. astigmatism can blur both dear and far objects. It can besides distort the images you see. astigmatism is not unusual. In fact, The american Academy of Ophthalmology reports that 1 in 3 people have the condition. If your astigmatism measures 1.5 diopters or more, you may need to wear prescription glasses or reach lenses to see by rights. That said, if you have any sum of astigmatism, you may appreciate the extra clarity of wearing prescription drug eyewear. Your prescription will indicate how austere your astigmatism is and where the irregular curve appears on your center.

Other lens recommendations

Your monocle prescription might besides include notes from your optometrist or ophthalmologist about other features of your glasses or contacts. Your lenses might :

  • be progressive or bifocal, meaning they correct for both distance and close-up vision.
  • have an anti-reflective or anti-glare coating to reduce glare to make it easier to see at night or when working on a computer
  • be photochromic, which means they darken or lighten depending on the lighting conditions around you
  • be treated with a coating to make them more scratch-resistant

Yes. Because contact lenses sit directly on the surface of your center, they need to have the lapp curves as your eye.

A liaison lens prescription contains measurements for :

  • Base curve: a number usually between 8 and 10 that conforms to the shape of your eye
  • Diameter: the distance from one side of the lens to the other, usually around 13 to 15 millimeters

Your liaison prescription drug besides identifies the trade name and type of lens, along with an exhalation go steady. Contact prescriptions have to be updated from year to year to account for changes to your vision and to ensure they fit properly.

How often should you see your eye doctor?

The American Optometric Association recommends that you have an eye examination at least every 2 years if you ’ re under 60 and every year if you ’ re over 60. It ’ sulfur important to have your imagination and eye health checked regularly because some serious eye conditions, such as glaucoma, don ’ t have obtrusive early symptoms. An center doctor can test your eyes and detect changes early, which may prevent vision loss. The tests are promptly and painless, and can besides help detect the come eye conditions :

  • cataracts
  • glaucoma
  • age-related macular degeneration

Eye exams can besides indicate when another health condition, such as diabetes or high blood atmospheric pressure, may be affecting the health of your eyes.

The bottom line

The abbreviations and numbers on your monocle prescription tell the monocle manufacturer what type of lenses you need and how potent they need to be. This information besides indicates the degree of myopia, prevision, or astigmatism in each of your eyes. Because contact lenses sit immediately on the open of your eye, they need extra information, such as the base and curve of your eye. Your monocle or contact lens prescription international relations and security network ’ t a one-and-done site. Over meter, your vision can change, so it ’ second important to see an eye repair at least every copulate of years to protect your eye health .

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Category : How To

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