Teaching case. A four-year-old, anisometropic amblyopia of 20/80, has never worn glasses. The resident immediately draws up a 6-hour patching regimen. The family is horrified. In its highlighted findings the PPP puts a different first sentence: treatment of refractive error alone can improve acuity in children with anisometropic, strabismic or combined amblyopia; in bilateral refractive amblyopia acuity also improves substantially with correction alone.
This is not the panel's "just in case" opinion. It is a reading of specific studies that the PPP includes.
- The spectacle phase of ATS5: 84 children aged 3–<7 years, previously untreated anisometropic amblyopia, up to 30 weeks. Gain of >2 lines in 77%, resolution in 27% with optics alone.
- In children aged 7–17 years the PPP cites a study in which about one quarter gained two or more lines with optics alone.
- Even with residual strabismus in glasses, the amblyopic eye can gain substantially with correction (a study the PPP cites separately).
- The bilateral refractive form: substantial gain with glasses without occlusion.
The PPP makes optics the initial step in children aged 0–17 years with amblyopia. There is often an immediate gain from the sharper image (BCVA better than uncorrected, but not yet normal — otherwise it would simply be refractive error, not amblyopia). After that, wearing the correction for up to 18 weeks can yield two or more lines in at least two thirds of children aged 3–7 years with previously untreated anisometropic amblyopia.
How to wear them. Children's frames, straps, spring hinges, impact-resistant lenses — especially in unilateral amblyopia: the fellow eye must not be left unprotected. Contact lenses are a tool, not a dogma. If the child takes the glasses off every ten minutes, the "perfect" dioptre on paper equals zero on the retina.
The debate about how long optics should run before occlusion. The classic European logic is extended optical treatment: months of glasses, then patching for those who have not reached the goal. EuPatch (a multicentre RCT, Lancet 2024) compared early occlusion after 3 weeks of glasses with extended optics of 18 weeks before occlusion in European children with amblyopia. Success after 12 weeks of occlusion: 67% (95% CI 60–75) in the early occlusion group versus 54% (46–62) in the extended optics group. This body of evidence is newer than the PPP search (May 2022). It does not abolish optics as a mandatory layer. It calls into question prolonged waiting before activating the worse eye — especially in those whom the EuPatch decision tree identifies as less likely to respond to glasses alone (more severe baseline acuity, older than approximately 5 years 4 months in their analysis). PEDIG ATS22 (NCT04378790) on sequential versus simultaneous glasses ± patching in children aged 3–<13 years is under way; a published primary paper was not found.
A practical assembly that can be defended by both the PPP and the newer RCT.
- Prescribe the full cycloplegic correction immediately.
- Do not start occlusion "automatically" at the same minute if the family has barely agreed to glasses — but also do not declare "four months of glasses only" a dogma if the amblyopia is severe and the child is no longer of preschool age.
- Monitor acuity: if it is improving on optics, this layer can continue; if it is static, do not lose months.
- Occlusion and atropine — for those whose deficit has not resolved on optics, and that is the next lesson.
Boundary. The course does not decide "3 weeks or 18" for the clinician. It forbids two extremes: patching without glasses when there is a refractive factor, and endless waiting in case "it catches up".