Buying kids glasses online is convenient and can save you cash. See our top picks and places to shop, according to moms and parents.

YEAH, AND IT’S ALL THANKS TO THE NONPROFIT CALLED SIGHTSAVERS. THESE KIDS ARE SO VISUALLY IMPAIRED THAT GLASSES, CONTACTS, EVEN SURGERY CAN’T CORRECT THEIR VISION AND THAT MAKES THEM LEGALLY BLIND.

Prescription eyeglasses can cost as much as $1,000, and most have plastic lenses, which scratch more easily than glass. Clearly, you need to protect your investment. But should you clean lenses ...