Average pupil distance male11/15/2023 Each number indicates information about your eye, vision, and how much correction is needed to achieve clear vision.Ĭertain abbreviations and numbers refer to specific eye conditions, such as the following: Many of the abbreviations in glasses and contact lens prescriptions are associated with numbers. Prescription Numbers for Certain Eye Conditions It is possible to use a different brand of contact lens in each eye based on the unique needs of each eye. Base curves vary by brand, so your prescription may change depending on what brand of lenses you are using.ĭiameter values range between 13 and 15. The base curve value of a contact lens typically ranges from 8.0 to 10.0. DIA, which is the diameter of the lens.BC, which is the base curvature of the lens.Because contact lenses sit directly on your eye rather than a few centimeters away, the power of a contact lens will also likely be different than an eyeglass prescription for the same person.Īdditional information provided on a contact lens prescription includes: The size of the lens, for example, is included for contact lenses. Abbreviations for Contact Lens PrescriptionsĬontact lens prescriptions provide the same information as eyeglass prescriptions, with the addition of some extra numbers. Keeping your eyeglass prescription up-to-date is essential for maintaining effective corrective eyewear. Numbers are also likely to vary between each eye and can change over time. Only the abbreviations applicable to your eye condition will be listed. You will not find all of the above abbreviations on every eyeglass prescription. BVD is the distance from the back of your glasses lens to the apex of your cornea, and it is adjusted to change the lens power. BVD: This is short for back vertex distance.Average PD is 62 mm for women and 64 mm for men, with an overall range of 58 to 68 mm. It is essential for creating effective and comfortable glasses. PD: This stands for pupillary distance, which represents the measurement of the distance (in millimeters) between the center of each pupil.SVN: This is short for single vision near, which is needed for the correction of near vision only.SVD: This stands for single vision distance, which is needed for the correction of distance vision only.AX: An abbreviation for axis, AX is a number between 0 and 180 that indicates the angle between the two meridians of an astigmatism.It is usually a number between -4.0 and +4.0. CYL: Short for cylinder, CYL indicates a correction for astigmatism.ADD: Short for addition, ADD refers to the power that needs to be added to the lens to improve near vision.PWR: Short for power, PWR can be a positive or negative number referring to the corrective lens power needed.OU: This stands for oculi uterque, indicating both eyes.OS: This stands for oculus sinister, indicating the left eye.OD: This stands for oculus dexter, indicating the right eye.Fortunately, the abbreviations have been standardized around the world, so you can take your eyeglass prescription to get a replacement set of glasses even when traveling or living abroad. In addition to SPH, many other abbreviations are included in an eyeglass prescription. The higher the SPH number, the stronger your prescription is, explains the American Academy of Ophthalmology (AAO). A negative number means that the lens is correcting for nearsightedness, while a positive number indicates a prescription for farsightedness. The SPH number on a glasses prescription is listed as a positive (+) or negative (-) number. Typical SPH numbers range between 0.00 and +/- 20.00. If the SPH value is 0.00, or noted by Plano, Pl, or an infinity sign, you do not have a vision distance problem. It is measured in diopters and suggests that you need a spherical correction for your sight.Īn SPH number indicates if you are farsighted or nearsighted. Sphere (SPH) on your eyeglass prescription refers to the amount of lens that is needed to bring your vision back to normal. Directly following an exam, your ophthalmologist can provide you with a prescription and bring you one step closer to achieving clear vision. The presence of certain values - such as cylinder, axis, or add power - informs anyone reading your prescription about the presence of conditions like astigmatism, nearsightedness, and farsightedness, or the need for bifocal or multifocal lenses.Ĭomprehensive eye exams are the only way to ensure that you are getting the correct glasses prescription and vision correction. The numbers on your eyeglass or contact lens prescription provide important information about your eye conditions. The base curvature and diameter of the lens are indicated on a contact lens prescription, as are the expiration date and brand of lens. Contact lens prescriptions have many of the same abbreviations as eyeglass prescriptions, with a few additional numbers.
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