Kids' Glasses Sizes — A Guide by Age (+ Fitting Tips)

Updated: 11 July 2026 · By the Eye-Shop.eu optical team

Children's eyes need protection from the sun even more than ours — and glasses that don't fit properly don't protect properly. This guide gives you the right size by age, the 4 fit checkpoints, and where to find the whole kids' range in Ray-Ban Junior, Polaroid Kids, Vogue Junior and the other kids' brands.

Size chart by age

Lens width is the most practical guide. The bands are indicative — every child is different, so the fit check below always matters too:

Age	Lens width	What to look for
0-2 years (baby)	37-42mm	Flexible frame, often with an elastic band
2-4 years (toddler)	41-45mm	Light, unbreakable materials
4-7 years	44-47mm	Most kids' models start here
7-10 years	46-49mm	The "heart" of junior collections
10-14 years	48-52mm	Junior versions of the classic models
Teens 14+	49-53mm	Small adult sizes often fit too

How to read the number

The system is the same as for adults: on the inside of the temple you'll find three numbers, e.g. 46 ☐ 16 − 125 — lens width, bridge and temple length, all in millimetres. The first is the "size". For what each one means in detail: what the numbers on glasses mean.

The 4 checkpoints for a correct fit

Before (and after) buying, check quickly:

• Eyes centred: the child's eyes should fall in the centre of the lenses — not high, not at the edges.
• Width: the frame shouldn't extend past the outline of the face, nor pinch at the temples.
• Cheeks: when the child smiles, the glasses shouldn't ride up against the cheeks.
• Ears and nose: the temples shouldn't press behind the ears; if the child bends over, the glasses shouldn't slip.

And the golden rule: don't buy a bigger size "to grow into". Glasses that dance on the face let the sun in from the sides and end up in a drawer.

Choose by brand

Junior models are designed for children's faces — not just "smaller" adult frames. Browse the whole range of kids' & baby sunglasses and specifically Ray-Ban Junior: each product page shows the available lens widths so you can match the age band above. As a guide, 46-48mm is the safe middle for primary-school age, while 50-52 suits pre-teens.

What else matters in kids' glasses (beyond size)

• UV400 protection, no compromise: a child's eye lens is clearer and lets more UV through — so all our kids' glasses have 100% UVA/UVB protection with CE certification.
• Materials that last: flexible, light frames that don't break in a bag or at the beach.
• For babies: prefer models with an elastic band — they stay in place whatever the little one does.
• Every product page at Eye-Shop lists the full dimensions — and if you're unsure between two sizes, send us the child's age and we'll advise.