Short answer: prescription swimming goggles are generally a better fit for children than contact lenses in the pool, because kids' myopia is often still changing, contact lens hygiene is harder to guarantee at that age, and a well-fitted Rx goggle gives clear vision without any of the infection risk contact lenses carry in pool or open water.
Swimming with contact lenses carries a real infection risk from waterborne microorganisms — including Acanthamoeba, a rare but serious cause of vision-threatening keratitis specifically linked to contact lens wear in water. That risk exists for adults too, but it's a harder standard to enforce with children, who are less likely to consistently remove lenses before swimming or handle them hygienically afterward. Prescription swim goggles remove the risk entirely — there's no lens touching the eye.
Childhood myopia frequently progresses year over year, sometimes faster than expected, which means a pair of Rx swim goggles bought today may need replacing sooner than an adult's would. This is a reasonable trade-off given the alternative (no correction at all, or contact lenses), but it's worth setting expectations with parents up front rather than positioning a first pair as a multi-year purchase.
A goggle that leaks or slides on a child mid-swim gets pulled off and abandoned within minutes, regardless of the lens quality inside it — fit and comfort are the actual deciding factor in whether a child will keep a prescription goggle on. Look for a soft, well-cushioned silicone gasket in a genuinely kid-sized frame rather than a scaled-down adult model, and an easily adjustable strap a parent (not just the child) can fit correctly before every swim.
Beyond the practical vision correction, a child who can actually see clearly underwater — the pool wall, the lane markers, other swimmers — tends to swim with noticeably more confidence than one swimming in a blur. For kids in swim lessons or starting competitive swimming, this isn't a minor comfort feature; clear vision genuinely affects how quickly they progress and how safe they feel in the water.
Stock a narrower diopter range than you would for adults — most children's prescriptions needing swim correction fall in the lower-to-mid range — and prioritize gasket comfort and strap adjustability in your buying decisions over marginal lens upgrades, since fit is what actually determines whether the product gets used.
See Salvador Eyewear's kids' sizing options in the prescription swimming goggles collection.