A contact lens prescription is specific to the prescribed lens, not just the power in your glasses prescription. Before ordering, match the manufacturer or brand, power, base curve, diameter when listed, and the prescription’s expiration date. Expiration rules depend on state law, with a federal one-year default where a state has not set a minimum.
A contact lens prescription identifies the particular lens fitted for your eyes. It contains more than lens power, so use the contact lens prescription itself when ordering and check that the selected product matches the details on it.
Fields to check
A valid prescription should include the fields FDA lists for the lens and the fitting:
| Field | What to match when ordering |
|---|---|
| Power | The prescribed corrective strength for each eye. |
| Manufacturer or material | The exact lens product, including the brand or equivalent identity listed. |
| Base curve | The prescribed lens curve or appropriate designation. |
| Diameter | The diameter when it is appropriate for that lens. |
| Issue and expiration dates | The dates attached to the prescription. Use the printed expiration date. |
| Prescriber details | The identifying and contact information required for the prescription. |
Some prescriptions also identify the manufacturer and equivalent brand for a private-label contact lens. Read the complete label or prescription rather than copying only the power from an old glasses prescription.
Order against the current prescription
Before placing an online or phone order, compare the lens product and each parameter with your prescription. If a seller offers a substitution or the product name differs, have your eye care provider confirm that it is the prescribed lens. The FDA says to use a current, valid prescription when ordering and not to order lenses against an expired prescription.
The expiration date is not a universal number. FDA guidance says states set the period in some cases; where a state has not established a minimum, the federal rule sets a one-year period unless the prescriber determines a medical reason for a shorter period. Use the expiration date printed on your prescription and ask your provider how to renew it.
For adjacent topics, see our guides to reading a glasses prescription, daily versus monthly contact lenses, and contact lens care, or browse the contact lenses category.
Sources
- FDA: Contact Lens Prescription (accessed 2026-11-04).
- FDA: Buying Contact Lenses (accessed 2026-11-04).
Common questions
Is a glasses prescription the same as a contact lens prescription?
No. A contact lens prescription includes lens-specific details such as the manufacturer or brand, base curve and diameter when appropriate, in addition to power.
Can I order contact lenses online?
Yes, with a current, valid contact lens prescription. Check that the lens and all listed prescription details match what your eye care provider prescribed.
How long is a contact lens prescription valid?
The expiration date depends on state rules and the prescriber’s medical judgment. Use the date on your prescription and ask your eye care provider about renewal.