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How to Read Your Contact Lens Prescription

Understanding your contact lens prescription might appear daunting initially, which is why we've simplified it for you.

The meaning for each abbreviation:

  • OD: Oculus Dexter (Latin for right eye)
  • OS: Oculus Sinister (Latin for left eye)
  • PWR: Power (also referred to as Sphere or SPH)
  • BC: Base Curve (usually a number between 8 and 10)
    • If your brand only comes in one base curve, your prescription will not contain a BC value
    • Your BC might be different depending on the brand
  • DIA: Diameter (usually a number between 13 and 15)
  • Brand: The brand of contact lenses fitted for your eyes
Sample Rx
Toric Prescription

Toric Lenses for Astigmatism

Astigmatism-correcting prescriptions include two extra numbers denoted by the following abbreviations:

  • CYL: Cylinder (usually a number between -2.25 and -0.75)
  • AX: Axis (usually a number between 0 and 180)

Multifocal Lenses for Presbyopia

Prescriptions for multifocal lenses for presbyopia (in one or both eyes) feature an additional indication of "high," "medium," or "low," represented by the following abbreviation:

  • ADD: Also known as "Add Power" or "Extra Strength"
Multifocal Prescription

Why Your Contact Lens Prescription is Important

Before purchasing contacts, it's essential to have a valid contact lens prescription. Your doctor prescribes a contact lens tailored to your eye shape by measuring your eye surface during a contact lens exam.

Regular annual eye exams remain essential for maintaining overall eye health. If you encounter any issues with the contact lenses prescribed by your eye care professional, always consult with them. For any inquiries or concerns, please don't hesitate to contact our Customer Service Team.