The Impact of Myopia Control Spectacle Lens Designs on Visual Function

PURPOSE: To profile the immediate effect of defocus-modulating and contrast-modulating myopia control spectacle lens interventions on visual function. METHODS: Healthy myopic (mean spherical equivalent (MSE) -4.25 to -0.50 D) young adults, corrected with contact lenses, wore diffusion optics technology (DOT), defocus incorporated multiple segments (DIMS), highly aspherical lenslets (HAL) and standard single vision (SV) plano trial spectacle lenses, in a prospective, single-visit, double-blind, four-way randomised crossover study. Distance and near high- and low-contrast visual acuity (VA), contrast sensitivity, reading performance, accommodative facility, visual search task and accommodative accuracy were assessed foveally through the central zone (CZ) and/or peripheral zone (PZ) of the lenses. RESULTS: Twenty participants (16 female) were recruited, with a mean (±SD) age of 22.4 (±2.72) years and MSE -2.21 (±1.10) D. VAs through the PZ differed significantly between myopia control lenses and SV, with the HAL and DIMS exhibiting lower VA across all testing conditions (all p 0.05); however, SV had lower variability at distance through the PZ than DOT, HAL and DIMS (p