CYL is the amount of lens power specifically for the correction of astigmatism. When an optometrist is conducting an eye exam, astigmatism is marked as part of the cylindrical (CYL) measurement. The optic nerve gets information from the retina to form a visual image. The condition causes distorted vision or blurriness due to the way light refracts on your retina (the layer at the rear of the eyeball, which contains cells that are sensitive to light). AstigmatismĪstigmatism is a common vision condition that is also accounted for on a prescription. Likewise, +1.00 is a minimal amount of farsightedness, and +5.00 is a greater degree and would similarly require more powerful correction. On the other hand, -4.25 means that you are more nearsighted and would require stronger glasses or contact lenses. A single diopter is a fairly small degree of nearsightedness. If you have one diopter of nearsightedness, your prescription will read -1.00. Generally speaking, if your prescription has a number that is far away from zero, the weaker your eyes are and the greater vision correction (stronger prescription) you need. Here, meridian refers to a hypothetical line on the surface of the eyeball, demarking the intersection with the surface of an imaginary plane that passes through its axis. Instead, it means that the correction for either nearsightedness or farsightedness is spherical, which means it is equal in all the meridians of the eye.
On an optometry prescription, sphere does not refer to the geometric shape. If the number appearing in this column has a negative sign (-), it means you are nearsighted a positive sign (+) means you are farsighted. This strength is measured in diopters (D), calibrated to adjust for nearsightedness or farsightedness. There are other abbreviations on your optometry prescription, such as sphere (SPH), which indicates the strength of the required lens. This is because when the doctor faces you, they will see your right eye on their left, and your left eye on their right, as they move across your face. When an optometrist fills out a prescription, the prescription chart will have a column for your right eye before the left eye. RE refers to right eye, for example, and LE refers to left eye. The Latin terminology is standardized for prescriptions for glasses, contact lenses, and medications for the eye, but some doctors and clinics have moved to more modern expressions for their prescriptions. Your prescription might also make reference to OU, which means oculus uterque (both eyes, in Latin). They refer to the oculus dexter, the Latin term for the right eye, and the oculus sinister, the Latin term for the left eye. When you get your prescription, you will see the terms OD and OS. What Are the Terms in an Eye Prescription? The better you understand your prescription, the better you will be able to take care of your eyes and make informed decisions when buying new contact lenses or glasses. This guide will tell you everything you need to know about your eye prescription.
You might see some abbreviated terms and numbers next to them. You do not have to purchase from the prescriber.Ĭoming out of an eye exam, an eye prescription can look confusing, and your optometrist might use words like astigmatism, nearsightedness, or farsightedness. Various other measurements determine the strength of the necessary corrective devices, to ensure that vision problems are fully addressed.Ī prescription for eyeglasses cannot be used to purchase contact lenses, and vice versa.Īs a consumer, you have the right to take your eye prescription and shop around for the necessary corrective eyewear. The measurements are expressed in the form of diopters. Eye prescriptions measure the strength of each eye.
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