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Open Access 01-12-2022 | Study protocol

Measuring aniseikonia and investigating neuroplasticity and image factors in amblyopia (MAGNIFY): study protocol for a randomised clinical trial

Authors: Jayshree South, Tina Gao, Melinda Calderwood, Jason Turuwhenua, Paul Roberts, Arier Lee, Andrew Collins, Joanna Black

Published in: Trials | Issue 1/2022

Abstract

Background

Aniseikonia represents a potential barrier to neuroplasticity which may limit visual outcomes in children with anisometropic amblyopia. Full correction of refractive error is the first step in standard amblyopia treatment, which corrects for image focus but neglects image size differences.

Methods

The MAGNIFY study is a double-masked, randomised clinical trial investigating the effectiveness of aniseikonia correcting lenses in children at first diagnosis of significant anisometropia. We hypothesis that aniseikonia correction lenses will improve image clarity and reduce the retinal size differences producing better visual acuity and stereoacuity improvements after 15 weeks of optical treatment for children with anisometropia. Eligible children will be randomly allocated to the treatment group (aniseikonia-correcting spectacle lenses) or control group (standard spectacle lenses). Visual acuity and binocular functions will be assessed every 5 weeks during the 15-week optical treatment phase according to standard amblyopia treatment protocol.

Discussion

It is possible that correcting aniseikonia along with anisometropia at first diagnosis will promote binocularity as well as increase spectacle adherence by reducing visual discomfort, improving optical treatment outcomes. This could then reduce the need for additional amblyopia treatment such as patching or atropine, reducing the burden on hospital eye departments and potentially improving visual outcomes for children with amblyopia.

Trial registration

Australian New Zealand Clinical Trials Registry (ANZCTR) ACTRN12620000061932. Registered on 24 January 2020. Protocol 15th November 2019, version one.

Available only for authorised users

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Title: Measuring aniseikonia and investigating neuroplasticity and image factors in amblyopia (MAGNIFY): study protocol for a randomised clinical trial
Authors: Jayshree South
Tina Gao
Melinda Calderwood
Jason Turuwhenua
Paul Roberts
Arier Lee
Andrew Collins
Joanna Black
Publication date: 01-12-2022
Publisher: BioMed Central
Published in: Trials / Issue 1/2022
Electronic ISSN: 1745-6215
DOI: https://doi.org/10.1186/s13063-022-06159-2

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Measuring aniseikonia and investigating neuroplasticity and image factors in amblyopia (MAGNIFY): study protocol for a randomised clinical trial

Abstract

Background

Methods

Discussion

Trial registration

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Methods

Discussion

Trial registration

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