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5. How to read my contact lens prescription?

Optometrist uses standard terms, abbreviations and measurements to write contact lens prescriptions. It may look like a secret code, but it's really quite simple to decipher.

Terms Abbr. Description OS (Left Eye)
OD (Right Eye)
Power/Sphere PWR/SPH A number between -20 and +20. -2.00 (example) -2.50 (example)
Base Curve BC A number between 8.0 and 10.0 or a phrase, such as steep or flat 8.9 8.9
Diameter DIA A number between 13.0 and 15.0. 14.0 14.0
Cylendar CYL A number between -0.75 and -2.25, for toric lenses only -1.00 -1.00
Axis AXIS A number between 10 and 180 (step 10), for toric lenses only 20 160
Colour COL For coloured lenses only Green Green
Brand Name Brand Name of Lenses. Acuvue Oasys Acuvue Oasys
Lens Type TYPE How ofter your lenses must be replaced (daily, weekly, etc.) Daily Daily


A toric lens prescription can be found from the lens package, and almost always are written in a format as the below sample (Sph Cyl Axis or Sph Cyl/Axis)

Toric Contact Lenses