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

Abstract

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.

Keywords: coaxial; contact lens; myopia; non‐coaxial; optics.

FIGURE 1

Ray bundles (right) from each zone of the Johnson & Johnson Vision ACUVUE® Abiliti™ 1‐Day (AB) (top) and CooperVision MiSight® 1 day (MS1d) (bottom) myopia control zonal lens designs (left) as they approach the nominal distance focal plane (0 D). Rays propagating through distance optic are coloured blue, whereas annuli and centre zones of added plus power are coloured orange and green, respectively. The retinal plane corresponding to 0 D of defocus is indicated with a red dashed line. The distance from the retina is defined in dioptres (D = 1/f), and the left‐ and right‐hand y‐axis defines millimetres from the optical axis and the angular extent of the retinal image plane in degrees, respectively.

FIGURE 2

Wavefront error (first column), wavefront slope (second column), slope‐derived power (third column) and curvature‐derived power (fourth column) maps for both the Johnson & Johnson Vision ACUVUE® Abiliti™ 1‐Day (AB) (top row) and CooperVision MiSight® 1 day (MS1d) (bottom row) lenses across a 6‐mm pupil diameter. Distance optics of these −3.00 D lenses have been focused.

FIGURE 3

Geometrical optics point‐spread functions for the Johnson & Johnson Vision ACUVUE® Abiliti™ 1‐Day (AB) (top row) and CooperVision MiSight® 1 day (MS1d) (bottom row) lenses for 3, 4, 5 and 6 mm diameter pupils. Each point spread function (PSF) is constructed from 205,890 individual rays that uniformly sample each pupil with ray densities of 29,127, 16,384, 10,486 and 7283 rays/mm² for pupil diameters of 3, 4, 5 and 6 mm, respectively.

FIGURE 4

Modulation transfer functions (MTFs) at the distance focal plane for the Johnson & Johnson Vision ACUVUE® Abiliti™ 1‐Day (AB) lens (green line) and CooperVision MiSight® 1 day (MS1d) (purple line) for 3–6 mm pupil diameters (left to right). The dashed curves are the corresponding diffraction‐only MTFs. c/d, cycles per degree.

FIGURE 5

Simulated retinal plane images for the Johnson & Johnson Vision ACUVUE® Abiliti™ 1‐Day (AB) and CooperVision MiSight® 1 day (MS1d) lenses, centred (panel a) and decentred (panel b), are computed for 3, 4, 5 and 6 mm pupil diameters. Letter E Snellen optotypes correspond to 6/36 (large E) and 6/12 (small E) or +0.80 and +0.30 logMAR, respectively.

FIGURE 6

Box and whisker plots for distance logMAR visual acuity (VA) (left) and subjective distance vision ratings (right) for both the Johnson & Johnson Vision ACUVUE® Abiliti™ 1‐Day (AB) (green) and CooperVision MiSight® 1 day (MS1d) (purple) lens designs. Box plots include a lower horizontal line corresponding to the first quartile (Q1), an upper horizontal line corresponding to the third quartile (Q3) and a middle horizontal line corresponding to the sample median. Sample means are indicated by dotted lines. The lower whisker extends to the smallest observation ≥Q1–1.5 × interquartile range (IQR), whereas the upper whisker extends to the largest observation ≤Q3 + 1.5 × IQR. Values beyond the whiskers upper and lower quartiles represent potential outliers. Double asterisks indicate statistical differences of p < 0.01.

FIGURE 7

Distribution of Likert responses for lens preference (panel a) and reason for lens preference (panel b) for the Johnson & Johnson Vision ACUVUE® Abiliti™ 1‐Day (AB) (green) and CooperVision MiSight® 1 day (MS1d) (purple) lens designs.