Peripheral defocus induced by «Perifocal-M» spectacles and myopia progression in children

Abstract

Peripheral defocus plays a significant role in refraction development. Spectacle lenses «Perifocal-M» allows to perform a correction of the central and peripheral refraction in the horizontal meridian differentially. The purpose was to determine the effect of «Perifocal-M» spectacles on the wave front aberrations, peripheral refraction and myopia development in children. 75 myopic children aged 9-14 with spherical equivalent cycloplegic refraction between -1,0 D and -6,0 D took part in the clinical prospective parallel cohort open study. Patients were randomly assigned to wear «Perifocal-M» or monofocal spectacles. It is noted that «Perifocal-M» spectacles form relative peripheral myopic defocus in the eye or decrease peripheral hyperopic defocus significantly, as well as induce positive spherical aberration. Decrease of the eye growth on 0,05mm, decrease of the myopic shift manifest refraction on 0,19 D, cycloplegic refraction on 0,11 D as compared to the control group were revealed after 6 months wearing of «Perifocal-M» spectacles. Decrease of the eye growth on 0,07mm, decrease of the myopic shift manifest refraction on 0,3 D, cycloplegic refraction on 0,27 D as compared to the control group were revealed after 12-18 months wearing of «Perifocal-M» spectacles. No one case of heterophoriadecompensation occurred while wearing «Perifocal-M» spectacles. «Perifocal-M» spectacles arrest the myopia progression in children.