Abstract
Aim: The purpose of this study was to compare the changes in relative peripheral refractive error produced by two different designs of progressive soft contact lenses in myopic schoolchildren. Methods: Twenty-seven myopic schoolchildren age between 13 to 15 years were included in this study. The measurements of central and peripheral refraction were made using a Grand-Seiko WR-5100K open-field autorefractometer without correction (baseline), and two different designs of progressive contact lenses (PCLs) (Multistage from SEED & Proclear from Cooper Vision) with an addition power of +1.50 D. Refractive power was measured at center and at eccentricities between 35º temporal to 35º nasal visual field (in 5º steps). Results: Both PCLs showed a reduction in hyperopic defocus at periphery. However, this reduction was only significant for the Multistage PCL (p= 0.015), (Proclear PCL p= 0.830). Conclusion: Multistage PCLs showed greater reduction in peripheral retinal hyperopic defocus among myopic schoolchildren in comparison to Proclear PCLs.
Highlights
The most common type of eye refractive error is called myopia, which is considered a global health problem[1]
Axial length measurement data is provided in the file “A-Scan”; Data for Table 2 “the mean spherical equivalent” and Table 3 “the relative peripheral refractive error” are provided as files “data Table 2” and “data Table 3”, respectively
The present study compared the effect of Relative peripheral refractive error (RPRE) along the horizontal visual field between two different designs of progressive contact lens (Multistage progressive contact lenses (PCLs) and Proclear PCL)
Summary
The most common type of eye refractive error is called myopia, which is considered a global health problem[1]. Studies conducted by Smith and colleagues in monkeys have shown that the fovea, and the peripheral retina, is capable of regulating the emmetropiszation process[4,5,6] This indicates that the peripheral retina is important in determining ocular development and refractive error. In 2009, Tabernero et al.[8] suggested that by changing the peripheral optics of corrective devices, relative hyperopic defocus in myopic eyes could be inverted into peripheral relative myopia. This could be a possible strategy to counterbalance the unknown stimulus that triggers the eye elongation and subsequent progression of myopia
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