Affiliation:
1. School of Health Sciences, Faculty of Biology, Medicine and Health University of Manchester Manchester UK
2. Centre for Myopia Research, School of Optometry The Hong Kong Polytechnic University Hung Hom Hong Kong
3. Centre for Eye and Vision Research (CEVR) Hong Kong SAR China
Abstract
AbstractPurposeInitial studies have suggested that multiple segment (MS) spectacle lenses can reduce the progression rate of childhood myopia and axial eye growth. This paper aimed to compare the effectiveness of two different available designs of MS lens and to explore the nature of their control effect.MethodPublished data from the only two clinical trials in which changes in mean spherical equivalent refraction (SER) and axial length (AL) for matched groups of myopic children wearing either MS or single‐vision (SV) spectacle corrections, recorded over a period of at least 2 years, were further analysed and compared. Both trials involved Chinese children of similar ages and visual characteristics, but the trials were located in different cities. The two MS lenses examined were MiyoSmart or DIMS (Hoya) and Stellest (Essilor).ResultsAbsolute changes in SER and AL differed over time during the two trials. However, if the results were expressed in terms of efficacy over successive 6‐month periods, then the two MS lenses produced broadly similar results (initial efficacy for the control of myopia progression of about 60%–80%, declining over 2 years to about 35%–55%). Control appears to be absolute rather than proportional.DiscussionMyopia control may be due to either the additional myopic defocus induced by the MS lenses (i.e., asymmetry of the through‐focus image changes about the distance focus) or to the general reduction in image contrast that the lenslets create in the peripheral field.ConclusionMultiple segment spectacle lenses offer a valuable new approach to the control of myopia progression in children. Further work is required to clarify their mechanism of action and to optimise their design parameters.
Subject
Sensory Systems,Optometry,Ophthalmology
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