Prescription Eyeglasses FAQ

Our most frequently asked questions, answered for your benefit. Need further assistance? We're available by email every day 8 a.m - 5 p.m PST.

Optical lenses, single vision and progressive lenses, mirror coating and polarized lenses

What type of lenses do you offer?

DIFF offers a wide range of lenses for prescription eyeglasses and sunglasses. Prescription lens options include super thin 1.6 and 1.67 Index. DIFF also offers light-adjusting photochromic lenses that change tint based on the light they’re exposed to. These are recommended for anyone that switches from indoor to outdoor environments often as the lenses become dark outdoors and nearly clear indoors.

How do I submit my prescription?

Once you have your prescription from your optometrist, you will be able to input your prescription information after you have selected the frame you want to purchase. DIFF also requires that you submit a photo or scan of your prescription so we can confirm we have all the necessary information to get your lenses created.

submitting prescription, upload, email or prescription is already on file

How do I find my pupillary distance (PD)?

Your PD is the distance between your pupils, and it helps us center your prescription correctly in your frames. It's important to note that the average PD is between 57 and 65mm. You may have two PD values - one for each eye. It is best to get this measured by your eye care professional. If your doctor did not include your single PD measurement with your prescription, follow these easy steps to find your PD before you start your order:

how to find pupillary distance, use a rule to measure the edge with your right pupil, mark location of your left pupil on the ruler or credit card, take the average measurement to ensure accurate PD after repeating multiple times

Please note: We're unable to fill expired eyeglasses prescriptions and prescriptions for contact lenses. If your doctor provided an expiration date on you prescription, we will always abide by the doctor's orders. If your doctor did not provide an expiration date, we'll adhere to the optical rules of the state where your prescription was written to determine if we're able to fill it.

What's the best way to clean my lenses?

To clean your lenses, simply rinse them with a mild soap and lukewarm water, and dry them with a soft cloth. For day-to-day cleaning of light smudges, a few swipes of the cleaning cloth included in your case should do the trick. Please be careful to avoid using hot water on your lenses (especially if they are high-index lenses), as they can develop bubbles or cracks when exposed to high heat.

What if I need to get the fit of my glasses adjusted?

Most optical shops are willing to do adjustments of glasses for free. We recommend calling a local shop near you to ask if they'll adjust them. If they do charge a fee for adjustment, DIFF will refund up to $15 of the fee if you send us the receipt.

Have Insurance?

DIFF can provide you a PDF version of your receipt upon request. You can provide this to your insurance provider for reimbursement.

What is your return policy?

We offer a 14 Day return policy with a 1 year warranty in case of any damages or scratches. Our warranty does not cover damage caused by accidents, negligence, or improper care. If the glasses are made incorrectly by our lab, we will remake them for no charge. If you are unhappy with the style of your glasses, we will gladly give you store credit upon return of your prescription glasses.

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