In short: Buying kids' glasses online comes down to three things: an up-to-date prescription with a pupillary distance (PD), a frame sized for your child's age, and a return window long enough to test the fit. Pair Eyewear makes kids' Base Frames for younger and older kids, from $80, including Rx, with free shipping in the US and 30 days to return or exchange.

What you need before you order

• A current prescription from your child's eye doctor. Ask for the PD to be written on it if possible.
• Your child's age range and face width. For small faces, size matters more than style.
• Your FSA or HSA card, or your vision insurance details, if you plan to use them.

Choosing the right size

Pair's kids' frames are sized by age.

For younger kids, start with The Cedro, an extra narrow rectangle, or The Serra, an extra narrow, modified round frame.

For older kids, look at The Otero, an extra narrow rectangle, The Twain, an extra narrow, modified square that also fits adults, and The Larkin, a narrow, modified rectangle for adults and older kids.

All five are from $80, including Rx. If your child is between sizes, go smaller. Frames that slide down the nose get pushed back up with sticky fingers all day.

Will they survive a kid?

No pair of glasses is kid-proof. A strap for sports, a hard case in the backpack, and a backup pair do more than any frame material will.

Getting kids to put them on is often the bigger job. Pair's magnetic Top Frames let kids change the look, including their favorite characters, without a new pair of glasses.

"My son who hated his glasses his whole life was actually looking forward to getting his new Pair. I'm trying to convert the whole family to Pair Eyewear." (Jill H.)

"The frames are sturdy and clear and the Toppers are adorable. She's having so much fun with them - we will definitely be getting more Toppers so she can match her glasses with her vibe for the day!" (Bethany C.)

You have 30 days from delivery to return or exchange, which covers a few school days and a weekend of real wear.

What it costs

Kids' Base Frames are from $80, including Rx, with single-vision prescription lenses. Upgrades like blue light filtering cost extra. FSA and HSA cards are accepted, and some vision plans, including UnitedHealthcare and Spectera, can be applied. Shipping is free on US orders.

Frequently asked questions

What size frame does a 4-year-old need?
Look for frames made for younger kids. At Pair, that's The Cedro or The Serra.

Can I return kids' prescription glasses?
Yes, within 30 days of delivery.

How much are kids' glasses at Pair?
From $80, including Rx. Lens upgrades cost extra.