Pair Eyewear's warranty policy allows you to modify or correct your product within 30 days from the day your order was delivered, according to their website. That includes adding transition lenses or swapping out for lenses without blue-light filtering, or correcting a mistake made during ordering.
Beyond the 30-day window, Pair Eyewear doesn't appear to warranty their products against breakage or natural wear-and-tear.
You can also purchase an extended warranty by adding PairCARE to your cart at checkout. You'll pay $40 to extend your warranty to 1 year.