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.A large number: Whether a + or -, a large number indicates a stronger prescription.Shortsightedness is when a person can see close things but distant objects appear blurry. Identify a – sign: Negative numbers, such as -1.00, indicate the lens strength needed to correct shortsightedness.Farsightedness means a person can see distant things but nearby objects appear blurry. Identify a + sign: Positive numbers, such as +1.00, explain how strong a lens needs to be to correct for farsightedness.The following tips can help people read their eye prescriptions: Share on Pinterest A person may require a different eye prescription for each eye.
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