Title : Short-term efficacy of defocus spectacle lenses in controlling myopia in children using multispectral refracion topographer
Abstract:
Purpose: The aim of this article was to investigate the changes in peripheral retinal defocus in children wearing defocus spectacle lenses and to evaluate its relationship with axial growth.
Methods: A total of 200 myopic children aged 8-14 who visited our hospital in June 2023 were recruited , and 68 chose single-vision lenses and 132 chose defocus spectacle lenses.All participants were measured with multispectral refraction topography (MRT) after cycloplegic. Relative peripheral refraction(RPR) in superior?inferior?temporal and nasal area from 15-45° were recorded.MRT and other refractive factors as axial length and myopia diopters were recorded at baseline and after 6 months.
Results: After 6 months in single vision lenses group, there was no significant change in RPR compare to baseline.Meanwhile nasal and inferior RPR detected a mild positive shift after 6 months. Nasal RPR, from 15-30° was significantly shifted toward negative in defocus spectacle lenses group after 6 months(P < 0.05). RPR myopic shift was associated with slow growth rate of axial length in nasal area(R = 0.353, P = 0.029), and 15-30° area (R = 0.401, P = 0.027).
Conclusions: RPRs of children show relative myopic defocus shift after wearing defocus spectacle lenses in nasal area at 15-30° of retina. The growth rate of AL is related to more negative RPR.
Keywords: myopia; MRT; defocus spectacle lenses;relative peripheral refraction;axial length
