Why Frame Choice Matters in Myopia Control

Quick answer: A myopia control lens only works if the child is looking through the right part of it — and a frame that slips takes the treatment with it. That’s the part of this conversation that gets almost no attention next to the lens itself, and it’s worth more of your time than it usually gets.

Peter Ivins Eye Care opened Scotland’s first dedicated myopia management clinic in 2013, and I have written before, at length, about the case for offering myopia management in the first place. This one is narrower: once you’ve made that decision and chosen a lens, the frame stops being a styling question and becomes a clinical one.

The bit every myopia control lens has in common

MiYOSMART, MiYOSMART iQ, Stellest, Stellest 2.0, SightGlass Vision DOT — different mechanisms, entirely, but structurally they share the same basic layout. A clear central optical zone corrects the child’s refractive error in the ordinary way; a treatment structure around it does the work of slowing axial elongation. MiYOSMART uses a 9.4mm clear zone with defocus segments arranged in a honeycomb across a 33mm area; MiYOSMART iQ narrows the clear zone, brings the segments closer in, and extends the treatment area to 41mm; Stellest surrounds a 9mm optical zone with eleven rings holding 1,021 aspherical lenslets, and Stellest 2.0 increases the mean power and asphericity of those lenslets under what Essilor calls H.A.L.T. MAX. DOT takes a genuinely different approach, using diffusion optics to reduce retinal contrast rather than inducing peripheral defocus at all.

The mechanisms diverge. The dispensing requirement doesn’t: the pupil has to sit in front of the central zone, consistently, for the hours the child is wearing the glasses.

What happens when the frame slips

Move the frame down the nose and the pupil rises relative to the lens. The child’s vision through the central zone degrades first — which is usually what a parent notices — and the treatment structure moves out of position at the same time, which is not something anyone notices, because it doesn’t announce itself. If the frame slips far enough, the child is simply looking over the top, receiving neither the correction nor the treatment, and everyone involved assumes the lens is doing its job.

What good centration actually requires of a frame

Hoya’s own fitting guidance for MiYOSMART calls for the pupil centred both horizontally and vertically in the frame, a vertex distance at or under 10mm, and pantoscopic tilt close to zero. Put that list next to a Tomato frame and you’ll see why we reach for it as often as we do in this context: a small eye size that keeps the pupil vertically centred without excess lens above and below it; an adjustable bridge that holds the frame at the height we set rather than the height gravity prefers; a short vertex distance and near-flat pantoscopic angle that a small, light, well-fitted children’s frame produces more or less by default; and a strap that keeps all of the above true while the child is playing rather than sitting still in a consulting room.

None of that replaces choosing the right lens design for the child in front of you. It’s the other half of the same decision, and it’s the half that tends to get skipped.

Where we sit on this

I was named Myopia Management Optometrist of the Year at the UK Optician Awards in 2023. Frame fit is something we check at every myopia management review at Peter Ivins Eye Care, not just at the initial dispensing appointment — faces change, and a frame that centred a lens correctly six months ago may not now.

Our west of Scotland myopia page covers the referral route and what a management programme involves, and the full detail on each lens design, including the trial figures behind them, is on our myopia management pages. This post deliberately doesn’t restate those numbers; they belong on the clinic pages.

Questions we are asked about this

Can any frame be used with MiYOSMART or Stellest?

Technically most can be glazed. Practically, the frame has to hold the clear central zone in front of the pupil and keep it there, which rules out anything that slides, sits low, or has a deep lens shape leaving the pupil high in the frame. Hoya publishes fitting guidance for MiYOSMART; it is worth a practice following it.

Does the frame really change how well a myopia control lens works?

It changes whether the treatment structure sits where the design intends. That is not the same as a claim about efficacy, and we would not make one — but a lens the child is not looking through cannot do what the trial measured. Centration is a dispensing requirement of every myopia control lens on the market.

How often should the frame be checked?

At every myopia management review here, not only at the first dispensing appointment. Children’s faces change, and a frame that centred a lens correctly six months ago may not now. There is no charge for the check or for the adjustment, which is deliberate — a review nobody attends is a review that finds nothing.

If your child is in or being considered for myopia control lenses, call 0141 943 3300 or email me directly at craig@peterivins.co.uk.