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How To Read Prescriptions

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Optical Prescription Terms:

  • OD - Right Eye
  • OS - Left Eye
  • Sphere (SPH) - Horizontal curve of the eye’s lens, also known as your prescription power.
  • Cylinder (CYL) - Indicates astigmatism. Tells the vertical curve of your eye.
  • Axis - The degree and direction of astigmatism. If you have a cylinder number, then you will have an axis number.
  • (For Contacts) BC - Base Curve. The fitting of the contact lens.
  • (For Contacts) DIA - Diameter. Measure of the lens width.