Lenses, not just frames
How to Buy Glasses Online Without a Bad Fit
Copy a frame that already sits, use a real PD, and stay single-vision unless you know your fitting height. The return window is part of the product.
Updated 27 Aug 2026 · 6 min read · how to buy glasses online
The measurements that actually transfer
Rx: sphere, cylinder, axis, add if any, and whether it is distance or near. PD: measured, not guessed. Frame: match a sitting pair within 2mm on bridge and 5mm on temple. Lens width can move 2–4mm if you know you wanted larger or smaller.
‘Try-on’ apps get shape in the ballpark and miss bridge height. If your last acetate sat on your cheeks, you need a different last, not a different filter.
What to order, and what not to
Good online: mild single vision, a copy of a frame you already wear, extra sun in the same shape. Bad online: first progressive, first wrap sport Rx, a 1.74 fashion rimless you have never touched.
| Order | Online? |
|---|---|
| Single vision, modest Rx, known size | Yes |
| Photochromic add-on on that pair | Usually |
| Progressives without fitting height | No |
| High wrap sport Rx | Risky |
| Kids’ first pair | Prefer in person |
When it arrives
Wear them two full days before you panic, unless the swim is immediate and nauseous — then stop. Check PD-sensitive issues: you should not have to look off-centre to clear a screen. Returns: keep the case and the mailer. A $10 optician tweak on a $59 pair is allowed and often the whole difference.
Questions, answered
- Are online lenses lower quality?
- Some are fine poly with AR. Some are uncoated and already scratched. Read whether AR and a hard coat are included, not the homepage adjective.
- Can I send an old frame in?
- Many labs will reglaze. That is often the best online purchase: lenses you specify, chassis you already fitted.
- What about sunglasses online?
- Easier if you copy a size. Still demand a UV400 claim you believe, or meter them when they land.
