Children's Glasses: Fit, Lenses and Getting Them Worn
A child's glasses have a job an adult's does not: they must survive a playground, and they must be worn. Comfort and fit decide both.
Signs a child may need glasses
Children rarely complain about blurry vision, because they have no reference for what normal looks like. What you see instead is behaviour.
- Sitting very close to the television or holding a tablet close to the face.
- Squinting, or tilting and turning the head to look at something.
- Rubbing the eyes frequently when not tired.
- Covering or closing one eye to focus.
- Losing their place while reading, or avoiding reading and close work.
- Headaches after school, or an unexplained drop in school performance.
- An eye that drifts inward or outward — this needs assessment promptly, not at the next convenient time.
When to have their eyes tested
A first check at around three years old, again before starting school, and then annually through the school years. Children's prescriptions change quickly while the eye is still growing, so a yearly retest is not an upsell — it is the interval the eye actually changes on.
Choosing the frame
- Bridge fit first. Children have flatter nose bridges than adults, so a frame designed for an adult face slides down no matter how tight the arms are. Look for frames made on a children's bridge, or with adjustable silicone nose pads.
- The eyes must sit in the centre of the lens. A frame that is too wide puts the child's pupils near the inner edge, which defeats the correction.
- Spring hinges. Children take glasses off by pulling with one hand; spring hinges are what stop that from bending the frame within a week.
- Flexible acetate or TR-90 for younger children; light metal or titanium works well from around ten.
- A retaining strap for toddlers and for sport. Not a compromise — it is what keeps the glasses on the face where they do their job.
- Let the child pick the colour. This sounds trivial and is the largest single factor in whether the glasses get worn.
Lenses: polycarbonate, always
For a child, this is not a preference. Polycarbonate is the impact-resistant material used in safety eyewear — it is dramatically harder to shatter than standard plastic, it is lighter, and it blocks UV inherently. A ball to the face is a routine event in childhood, and the lens material is what decides whether that becomes an eye injury.
Add an anti-reflective coating for classroom and screen work, and a scratch-resistant coating as standard. Skip high-index materials unless the prescription genuinely needs it — polycarbonate is already thin enough for most children's powers.
When they refuse to wear them
Refusal is almost always a fit problem wearing a behaviour costume. Before treating it as defiance, check three things: does the frame slide down, does it press behind the ears, and does it leave red marks after an hour? Any of those and no amount of encouragement will work.
If the fit is right, build the habit in short blocks tied to something they want to see clearly — a screen, a book, a game — rather than demanding all-day wear from day one. Most children who can genuinely see better with the glasses on will choose to keep them on within a fortnight.
Children's-bridge frames with spring hinges, fitted with polycarbonate lenses as standard.
Browse kids' framesFrequently asked questions
At what age should a child have their first eye test?
Around three years old, and again before starting school. Testing does not require the child to read letters — optometrists use picture charts and objective instruments that work with pre-readers. Any concern at any age is a reason to test sooner.
Why do children need polycarbonate lenses?
Because they are impact-resistant. Polycarbonate is the material used in protective safety eyewear and is far less likely to shatter than standard plastic. It is also lighter and blocks UV without an added coating, which makes it the correct default for any child regardless of prescription strength.
How often should children's glasses be replaced?
Retest annually, and expect the frame to need replacing every one to two years as the face grows and from ordinary wear. Bring them in for a free adjustment any time the fit slips — a frame that has been bent out of shape stops correcting properly even with the right lenses in it.
Will wearing glasses make my child's eyes weaker?
No. This is a persistent myth. Glasses correct the focus of light entering the eye; they do not change the eye's structure or make it dependent. What does cause lasting harm is leaving a correctable problem untreated during the years the visual system is still developing.