Optical characterisation and vision quality assessment of two myopia control contact lenses.

Purpose: This investigation examined the image and vision quality of two commercially available daily disposable myopia control soft contact lenses.

Methods: Wavefront errors were measured with an SHS Ophthalmic aberrometer for two myopia control soft contact lenses: a coaxially designed dual-focus lens (omafilcon A, CooperVision MiSight® 1 day, MS1d) and a design employing multiple add powers that included non-coaxial optics in annular add zones (senofilcon A, Johnson & Johnson Vision ACUVUE® Abiliti™ 1-Day, AB). Geometric optics ray tracing generated point-spread functions and wave optics were used to compare modulation transfer functions (MTFs) and simulated letter images. Twenty-six myopic children completed a randomised, non-dispensing, contralateral double-masked clinical trial. After 1 h of wear, right and left eye visual acuity (VA), subjective vision quality and lens preference (Likert) were assessed while viewing monocularly.

Results: The lens containing non-coaxial optics employed a small central zone with approximately +10.00 D of added power and two annular rings with a power gradient typical of non-coaxial optics. The coaxial design contained a centre zone with a distance correction and two annular zones with a fixed add power of approximately +2.00 D. MTFs and simulated images were better with small pupils, which was most noticeable with the coaxial design. Distance VA was -0.02 ± 0.04 with MS1d and 0.09 ± 0.08 with AB, p < 0.01. The majority of participants (77%) reported a preference for one lens; 54% preferred the MS1d and 23% preferred the AB lens.

Conclusions: Myopia control contact lenses employing coaxial or a mixture of coaxial and non-coaxial optics both reduced retinal image contrast but successfully imaged high spatial frequencies and provided high quality of vision. Image and vision quality were slightly superior in the lens employing coaxial optics alone.