The Impact of Myopia Control Spectacle Lens Designs on Visual Function.

Area of Science:

• Ophthalmology
• Optometry
• Vision Science

Background:

• Myopia control spectacle lenses aim to slow myopia progression.
• Understanding their immediate impact on visual function is crucial for clinical adoption.

Purpose of the Study:

• To evaluate the immediate effects of novel myopia control spectacle lenses on visual function.
• To compare defocus-modulating and contrast-modulating lens designs against standard single vision lenses.

Main Methods:

• A prospective, double-blind, randomized crossover study involved 20 healthy myopic young adults.
• Participants were fitted with diffusion optics technology (DOT), defocus incorporated multiple segments (DIMS), highly aspherical lenslets (HAL), and standard single vision (SV) lenses.
• Visual acuity, contrast sensitivity, reading performance, and accommodative function were assessed through the central and peripheral zones of the lenses.

Main Results:

• Myopia control lenses (HAL, DIMS) showed reduced peripheral visual acuity compared to SV lenses.
• Peripheral contrast sensitivity was lower for HAL and DIMS lenses.
• Near acuity and reading speed through the periphery were comparable for SV, DOT, and HAL, but worse for DIMS.
• Accommodative response and facility showed no significant differences across lens types.

Conclusions:

• All tested myopia control spectacle lenses demonstrated visual performance comparable to standard SV lenses in the central visual field.
• Significant differences in peripheral visual performance, including visual acuity and reading speed, were observed.
• Clinicians should consider these peripheral visual performance differences when prescribing myopia control lenses.