Updated: January 19, 2026
No, contact lens and glasses prescriptions are not the same. Contact lenses sit directly on the eye, so the power can differ from glasses that sit in front of the eye, especially for stronger prescriptions. Contact lens prescriptions also include fit and product details to help ensure the lenses are safe and comfortable to wear.
What to Check:
- Glasses prescriptions list vision power values (like SPH, CYL, and AXIS), while contact lens prescriptions also include lens-specific fit details such as BC (base curve) and DIA (diameter).
- Contact lens prescriptions may specify the exact brand or manufacturer and lens type (for example, toric or multifocal), because changing brands can change fit and comfort.
- Contact lens power is not always interchangeable with glasses power due to vertex distance, so converting a glasses prescription yourself can lead to incorrect vision or discomfort.
- A contact lens prescription also has an expiration date and should come from a contact lens exam and fitting, not just a glasses exam.
- If you only have a glasses prescription, you’ll need a contact lens fitting to get the correct lens brand, size, and power for your eyes.
Glasses and contact prescriptions serve different purposes, so the safest approach is to use the prescription written specifically for the correction method you plan to wear.
Disclaimer: This information is for general informational purposes only and is not a substitute for professional advice, diagnosis, or treatment.
References:
Contact Lens Prescription. U.S. Food and Drug Administration (FDA). https://www.fda.gov/medical-devices/contact-lenses/contact-lens-prescription. October 28, 2020.
The Contact Lens Rule: A Guide for Prescribers and Sellers. Federal Trade Commission (FTC). https://www.ftc.gov/business-guidance/resources/contact-lens-rule-guide-prescribers-sellers. Updated February 2023.
How to Read an Eyeglasses Prescription. American Academy of Ophthalmology (AAO). https://www.aao.org/eye-health/glasses-contacts/how-to-read-eyeglasses-prescription. Updated April 18, 2023.
