The second-pair numbers, clearly
COUPON20 Explained: What Two Pairs of Prescription Glasses Cost
COUPON20 means 20% off one lowest-priced eligible complete pair when you buy at least two complete pairs in one order. Here is how to compare the total without mistaking the offer for 20% off everything.
By the Fast Eyeglasses team · October 21, 2026
Start with a complete pair
An everyday $79 base pair includes a frame and standard single vision prescription lenses. Selected lens upgrades and prescription-strength charges can increase the price. Compare the exact configuration you intend to buy, not just the frame image or starting price.
Our online glasses price-comparison guide explains why a complete quote matters. The lens-upgrade cost guide is another useful companion.
Example: two $79 base pairs
Two eligible $79 pairs have a combined base price of $158. Twenty percent of one $79 pair is $15.80. Subtract that once, leaving $142.20 before any applicable tax or additional charges. Free shipping applies to eligible destinations.
One $79 pair does not qualify. Adding COUPON20 to a one-pair order does not turn it into a discounted pair, and the code does not create a second discount when the qualifying second-pair saving already applies automatically.
Example: a $114 pair and a $79 pair
If one everyday pair has the $35 standard anti-glare option and the other stays at the $79 base, the eligible pair prices are $114 and $79. Their total is $193. The discount uses the lower eligible pair price, so the saving is $15.80 and the example total is $177.20 before applicable tax or other charges.
Selected lens upgrades count toward an eligible pair’s price. Prescription-strength charges are excluded from the discounted amount. A different configuration can change the comparison; review the actual checkout breakdown rather than assuming the examples match your prescription.
Compare the purpose as well as the price
A spare at home, another everyday style or a second configuration for the same prescribed task may be useful. Choose the prescription and lens purpose first. Do not buy a second pair merely to make a code apply if you will not use it.
Try the glasses cost calculator to explore configurations. Then check the current lens menu and the actual product page before relying on a quote. Availability and chosen options matter.
Read the terms before paying
You need at least two complete pairs in the same order. The offer discounts one lowest-priced eligible pair, not every additional pair and not the whole basket. It cannot combine with Fast Cash, and entering the code does not add another saving to the automatic qualifying discount.
Checkout currently uses one prescription per order. Contact us first about different prescriptions or wearers. Custom-made orders are final for changes of mind and customer-selected fit or entered prescription/PD errors; published remedies apply to qualifying lab errors, defects and shipping damage. Read the full offer terms and return policy.
Put this guide to work
Compare the relevant frames and ordering details before choosing your pair.