Fytoo has a strong headline offer: an 18% discount on prescription glasses that applies to all eyewear across the site. This is the best deal for anyone buying glasses, though Fytoo also runs several tiered dollar-off codes and flash sales that might suit you better depending on what you're buying and how much you're spending.
Buying prescription glasses under $100. The 18% off prescription glasses code at the top of this page is your best bet. On a $80 pair of frames, that saves you $14.40—much better than the smaller dollar-off codes which would only give you $10 off on an order over $80.
Buying prescription glasses between $100 and $180. Again, reach for the 18% off prescription glasses voucher. On a $150 pair of glasses, that's $27 in savings versus $15 from the dollar-off code for orders over $120.
Buying prescription glasses for $180 or more. Compare the 18% off code against the $25 off codes available on orders over $180. On a $200 order, 18% saves you $36, so the percentage deal still wins. At $250, the 18% code gives $45 off, which is still ahead of the flat $25 discount.
Buying non-eyewear items under $50. Check whether the flash sales apply to your items. If not, the $6 off code for orders over $50 won't work, but if you're close to that threshold and add one more item, the $6 saving is available. Alternatively, the 10% off code on orders under $10 works for very small baskets.
Buying non-eyewear items between $50 and $80. The $6 off code for orders over $50 gives you a small saving. If you think you might add more items to reach $80, holding out for the $10 off code over $80 could be smarter.
Buying non-eyewear items between $80 and $120. The $10 off code for orders over $80 applies here. If you're close to $120, another item would qualify you for the $15 off code instead.
Buying non-eyewear items for $120 or more. The $15 off code for orders over $120 is your baseline. If your order reaches $180, the $25 off code is worth comparing—on a $200 order, that's $25 in savings versus $15.
Buying from the flash sales. The current Flash Sale with up to 98% off selected sale styles (running through early September) can beat any code if the items you want are in the sale section. The Thursday Frenzy Sale on selected glasses (through September 3) and the Buy One Get Other Frames 50% Off deal are both worth checking before applying a code.
Getting free shipping. Free shipping applies automatically on orders over $59—no code needed. This stacks with your discount code.
Remember: only one code can be used at checkout, so calculate which offer gives you the biggest saving on your specific basket before you buy. Sales and flash deals usually beat codes, so browse those first if they're still running.