Understanding Your Contact Lens Prescription #3 - Cylinder

By editor
November 3, 2009

A cylinder measurement is necessary if your lens corrects for astigmatism (the cornea’s oval, rather than round, shape). Measured in diopters (a unit for refractive power of lenses), the cylinder shows how much astigmatism you have. The negative sign means myopic astigmatism (inability of the eye to focus sharply on distant objects). A plus sign would mean hyperopic astigmatism (inability of the eye to focus sharply on nearby objects). For further information or to book a contact lens appointment with one of our doctors please call any of our three Rochester, NY Cornerstone Eye Associates locations in Gates (585-328-0153), Brighton (585-244-2200) or Irondequoit (585-266-7880).

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