Before ordering glasses online, get a current eyeglass prescription and the pupillary-distance measurement the retailer requests. Compare the new frame with a pair that already fits, enter each prescription field carefully and review lens options, delivery timing, adjustment help and return terms. If the prescription or fit is complex, or the retailer cannot explain its fitting process, an in-person optician can help you avoid a poorly matched order.
Online glasses are easiest to order when you have a current prescription, the required pupillary distance (PD), and a frame size that already suits you. Check each prescription field and the retailer’s adjustment and return terms before paying.
Gather the information first
- Get the full prescription. The Federal Trade Commission says the Eyeglass Rule requires eye doctors to give patients a copy after a refractive exam. Check the dates, values and any lens-specific fields before entering them.
- Ask about PD. Some states require PD on the prescription. The FTC notes that online buyers may need the measurement; ask your provider or the retailer how it is measured and recorded.
- Keep your current frames nearby. Compare the lens width, bridge width and temple length printed on a frame that fits. These numbers are a starting point, not a guarantee that a new shape will sit the same way.
- Know the intended use. Single-vision, reading, computer and progressive lenses do not serve the same viewing distances. Match the lens type to your prescription and the task you plan to use it for.
Check the frame and lens order
| Before checkout | What to verify |
|---|---|
| Prescription entry | Right and left eye, sphere, cylinder, axis, ADD and any prism fields copied to the correct boxes |
| PD | Whether the retailer asks for one binocular value or separate monocular values, and how it wants the measurement supplied |
| Frame fit | Lens width, bridge, temple length, frame width and lens height compared with a pair you can wear comfortably |
| Lens choice | Lens material, coatings, tint and design match the prescription and use |
| Terms | Return window, prescription remake policy, shipping, adjustment support and whether custom lenses are returnable |
Use the retailer’s own instructions for entering the prescription. Do not guess at a missing field or reuse a measurement from a different frame. If an order page does not explain how a measurement is used, contact the seller before ordering.
When to choose an in-person fitting
Consider an optician if you are ordering a new progressive design, have a prescription feature the website does not explain, need unusual frame adjustments, or are not confident about PD or fitting height. Online previews can help with appearance, but they do not establish that a frame is comfortable or that the finished lenses are properly positioned.
Our guide to reading a glasses prescription explains common abbreviations, and the frame-size guide covers the three frame measurements. Browse the eyeglasses category.
Official reference
Common questions
Do I need my pupillary distance to buy glasses online?
Many online retailers ask for pupillary distance to position the lenses. The FTC notes that some states require it on the prescription and that online buyers may need the measurement, so ask your eye-care provider or retailer how to obtain it.
Can I use an expired prescription to order glasses?
Check the expiration date and the rules where you live. An online retailer may require a current prescription, and an eye-care professional can tell you whether a new exam is due.
Are progressive lenses a good first online order?
They can require more fitting information than single-vision lenses. Confirm the retailer's fitting measurements and adjustment policy, and consider an in-person fitting if you are unsure.