![]() ![]() Usually, these differences are not due to illness. PRISM: Eye doctors incorporate a prism into a lens to help correct problems with the eyes working together, such as one eye tilting inward while the other looks straight ahead.Ī person with any questions about what their prescription means should speak to their optician who can answer any questions and help explain the numbers.Įyeglass prescriptions change because people’s eyes change.AXIS: The axis notation tells lens makers where they should place the astigmatism correction in a lens.ADD refers to the strength that the optician needs to add to a prescription to magnify objects. ADD: Some people need a different prescription to see things that re close by.Cylindrical correction (CYL): Cylindrical correction is the second number and is only on prescriptions for people with astigmatism.Spherical correction (SPH): The spherical correction (SPH) refers to the lens strength needed to correct vision that affects the whole eye. ![]() Eye differences: It is common for people to have different qualities of vision in their left and right eyes, particularly those with astigmatism.OD stands for Oculus Dexter and refers to the right eye. OS and OD: On an eyeglasses prescription, OS stands for Oculus Sinister, which refers to the left eye. ![]()
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