Glasses.com has a $40 off voucher at the top of this page for progressive, blue light or Transitions lenses, and that voucher is best for you when your order includes those lens upgrades and your cart reaches the voucher minimum. The voucher takes $40 off but needs a minimum order value of $250. If you are buying contact lenses, frames, or a mix of items that qualify for sitewide sales, one of the percentage promotions may save more on a larger spend.
If your order is under $250: the $40 voucher is not available because it requires a $250 minimum. For small purchases of contact lenses, use the 15% off contact lenses plus free shipping. For example, on a $80 contact lens order the 15% discount reduces that line to $68 and you also get free shipping, so you save $12 on the lenses. Offer applies to contact lens purchases only.
If your order is $250 exactly or just above $250 and includes the applicable lenses: use the $40 off voucher at the top of this page, which requires a minimum order value of $250. On a $250 order, the voucher takes $40 off, leaving $210, so you save $40. The same $40 saving is available via the $40 off orders over $250 deal listed on the page, which also has a $250 minimum. Either one yields the same $40 reduction on a qualifying $250 purchase.
If you are buying frames or frames plus lenses and the items are in the sale: check the sale prices marked as up to 50% off and the separate 30% off designer frames deal. Sale discounts apply only to selected items and some promotions require a frame purchase to get lens discounts. For example, if a designer frame costs $400 and it is eligible for 30% off, the frame price falls to $280, a $120 saving. If your cart is mostly sale eligible frames and lenses, those percentage discounts will often beat the fixed $40 voucher on higher priced items. Sale offers often say they cannot be combined with other discounts or insurance benefits; treat each sale price on its own.
If you are buying contact lenses and nothing else: use the 15% off contact lenses plus free shipping, since the voucher targets lens upgrades rather than standard contact lens purchases.
When choosing between the options, work out the final total for your exact items and take whichever leaves the lower total. If your cart meets the $250 minimum and includes the progressive, blue light or Transitions lenses the $40 voucher is a simple guaranteed reduction. If your items are marked in the up to 50% off sales or qualify for 30% off designer frames, run the sale price on those specific items and use the sale when it gives a larger dollar saving. Where a sale term expressly forbids combining with other discounts, do not combine; otherwise compare the single best discount for your basket and pick the lowest final price.