Visual performance of myopia control soft contact lenses in non-presbyopic myopes

Abstract

PurposeTo compare the visual performance of soft contact lenses reported to reduce myopia progression.MethodsIn a double-blind, randomized, crossover trial, 30 non-presbyopic myopes wore MiSight™, center-distance Proclear® Multifocal (+2.00 D add), and two prototype lenses for 1 week each. High- and low-contrast visual acuities at 6 m, and 70 and 40 cm; stereopsis at 40 cm; accommodative facility at 33 cm; and horizontal phoria at 3 m and 33 cm were measured after 1 week. Subjective performance was assessed on a numeric rating scale for vision clarity, lack of ghosting, vision stability, haloes, overall vision satisfaction, and ocular comfort. Frequency of eye-strain symptoms and willingness to purchase lenses were also reported with categorical responses. Participants reported wearing times (total and visually acceptable). Linear mixed models and chi-square tests were employed in analysis with level of significance set at 5%. Theoretical optical performance of all lenses was assessed with schematic myopic model eyes (−1.00, −3.00, and −6.00 D) by comparing the slope of the edge spread function (ESF), an indicator for optical performance/resolution and the blur patch size of the line spread function, an indicator for contrast, between the lenses.ResultsProclear Multifocal and MiSight provided the best distance acuities. However, the prototype lenses were rated significantly higher for many subjective variables, and there were no subjective variables where commercial lenses were rated significantly higher than the prototypes. Theoretical optical performance showed steeper slopes of the ESF and greater blur patch sizes of the LSP with commercial lenses, supporting the clinical findings of better visual acuities but reduced subjective performance. Participants wore prototypes longer and reported their vision acceptable for longer each day compared to MiSight. Both prototypes had the highest willingness-to-purchase rate.ConclusionsThe prototypes were better tolerated by myopes compared to the commercial soft contact lenses currently used for slowing myopia progression.

Comparison of short‐term light disturbance, optical and visual performance outcomes between a myopia control contact lens and a single‐vision contact lens

“…Fedtke et al 39 reported that decentred multifocal contact lenses with higher power variations produce lower subjective ratings. Sha et al 25 found that two prototype lenses were tolerated better by non‐presbyopic myopes than the DF design lens used in the present study and another commercially available, centre‐distance multifocal contact lens. Wahl et al 31 noted that disability glare was higher with a centre‐distance contact lens than a centre‐near design.…”

“…Different studies have not reported significant differences in distance VA and stereopsis under light conditions between myopia control DF and SV contact lenses or spectacles 1,10,12,21 . Sha et al 25 found that the DF design used in the present study and a centre‐distance multifocal contact lens (Proclear Multifocal Dominant, http://www.coopervision.com) provided excellent high and low contrast VA at all distances. Similar outcomes were reported in the multicentre clinical trial by Chamberlain et al 10 …”

“…Finally, the study was carried out in a young adult sample, and so might not be representative of children. As the task and protocol were long, young adults were chosen so that they could respond accurately 25 . Nevertheless, these differences are not expected to affect the observed outcomes significantly.…”

Ocular and Corneal Aberrations changes in controlled randomized clinical trial MiSight® Assessment Study Spain (MASS)

“…[22][23][24] In terms of best corrected visual acuity (BCVA), MiSight has recently been shown to provide satisfactory visual acuity at both long and short distance. 25 Based on the above-mentioned facts, the present study consists of comparing the aberrations in the eyes of children randomly allocated to: 1) a control group using single-vision (SV) spectacles, and 2) a study group in which children wore a myopia control MiSight lens over a period of 24-months. The main objective of the study was to determine the differences between the ocular and corneal aberrations arising from the myopia progression in both control and study groups.…”

Changing accommodation behaviour during multifocal soft contact lens wear using auditory biofeedback training

“…By reducing hyperopic peripheral defocus and thus moving the peripheral image forward, possibly even creating myopic defocus, the stimulus for eye elongation is thought to be reduced. Visual performance with bi-and multifocal soft contact lenses was previously investigated in pre-presbyopic subjects with respect to the quality of vision [12][13][14] and changes in the accommodation behaviour 7,[15][16][17][18][19][20][21][22] . A recent investigation by Gong et al 23 showed that children fitted with centre-distance multifocal soft contact lenses with a positive addition of +2.5 D (Biofinity, comfilcon A, Cooper Vision) used the lenses' addition power during near vision to relax their accommodation.…”