Questions about your glasses

OD is your right eye and OS your left (OU means both). SPH is the main lens power, CYL and AXIS correct astigmatism, and ADD is the extra reading power used in progressive and reading lenses.

Type the numbers in when you choose your lenses, or upload a photo of your prescription. We check every prescription before your lenses are made.

Your eye doctor sets an expiration date because vision can change over time. If yours has expired, we recommend a new eye exam before you order; if you're not sure, contact us.

PD (pupillary distance) is the space in millimeters between the centers of your pupils, and it tells the lab where to center each lens. Many eye doctors write it on the prescription; if yours doesn't have it, measure it with a millimeter ruler in front of a mirror, or ask your eye doctor. Two numbers, like 31.5/32, are a dual PD (one per eye): send us both.

Single vision has one power across the whole lens, for distance or for near. Progressives blend distance, computer and reading zones with no visible line and need an ADD value on your prescription; readers only magnify and need no prescription. More in the lens guide.

It's optional. A blue-light filter is meant for long hours on phones and computers, and an anti-reflective coating also cuts screen glare. You can add it with or without a prescription.

The stronger your prescription, the more a high-index lens (1.61, 1.67 or 1.74) thins and lightens the edges. For kids and sports we recommend polycarbonate, which resists impact.

Anti-reflective cuts glare and reflections, scratch-resistant adds a hard protective layer, and UV protection blocks ultraviolet light. For the sun, light-responsive lenses darken outdoors and polarized lenses remove glare from water and the road.

Look inside the arm of a pair you already own: the three numbers (for example 52-18-140) are lens width, bridge and temple length, in millimeters. Frames with similar numbers will fit in a similar way; the fit guide explains each one.

As a rule of thumb, angular frames add definition to round faces and rounded frames soften square ones. Take the style quiz for three shapes matched to your face and taste, or see the face-shape guide.

Usually, yes. Metal frames with nose pads are the easiest to adjust, and an optician can reshape acetate arms with gentle heat. Contact us and we'll help you find the best fix.

Yes. For kids we recommend polycarbonate lenses, which are light and impact-resistant, in frames sized for smaller faces; flexible materials like TR-90 hold up well to everyday play.

Prescription glasses are made to order, so timing depends on the lenses you choose. Current shipping options, times and costs are in our Shipping policy.

When your order ships, we email you a tracking link. If you can't find it, contact us with your order number and the email you used, and we'll look it up.

Contact us as soon as possible with your order number: lenses are made to your prescription, so changes are easiest before the lab starts. Return and exchange terms are in our Returns policy.

Yes. Switch the site to Spanish at the top of any page, and write or call us in Spanish whenever you like.

Prescription eyeglasses are generally an eligible expense for FSA and HSA accounts. Whether we accept FSA/HSA cards at checkout will be confirmed at launch; meanwhile, you can pay another way and submit your itemized receipt to your plan.