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What is an "ADD" Power on a Contact Lens Prescription?

When you read your contact lens prescription, do you see "ADD" and wonder what it means?

"ADD" stands for "additive" and is a term used in contact lens prescriptions to indicate the additional magnifying power needed for reading or other close-up tasks. The ADD power is added to the distance power (SPH) of the prescription to create a multifocal lens, which can correct both near and far vision.

ADD is typically used in contact lens prescriptions for individuals who have presbyopia, a common age-related condition in which the eye's ability to focus on close-up objects decreases. Presbyopia often starts to develop in people over the age of 40, and the addition of an ADD power in contact lenses can help to correct this problem.

The ADD power is measured in diopters (D) and can vary depending on the individual's specific visual needs. It's important to have a comprehensive eye exam and contact lens fitting by a qualified eye care professional to determine the appropriate ADD power for your contact lenses.

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