Abstract
Purpose :
To compare the effects of the novel multifocal soft contact lenses (ArtMost SoftOK SMR SCLs) with that of single vision soft contact lenses (SVSCLs) on myopic eye’s peripheral refraction while looking at distance and near.
Methods :
25 young myopic subjects were recruited in this study. Participants’ right eye refractive power were measured at center and at horizontal eccentricities between 30 temporal to 30 nasal retina (in 10steps) with no lens wear(baseline) and two different types of SCLs correction(SVSCLs and SMR) in sequence while looking at distance(5m) and near(40cm). Spherical equivalent refraction (M), astigmatism component J45and J180were used to describe and analyze the peripheral refraction.
Results :
When looking at distance target with SMR, the measurements showed strong peripheral myopic defocus profile comparing with central retina (except N20, N10), and myopic defocus increased with angle (all p <0.001). When fixating at the near target (40cm) with SMR, although hyperopic defocus was measured centrally (N10,0; p<0.01) and not significantly different than zero at adjacent locations(N20, N10; p=0.677,0.067), the defocus was still significant myopic in other peripheral locations (p<0.01), regardless of accommodative lag (response average 1.67±0.31D to 40cm accommodative stimulation) and hyperopic RPRE profile change at all locations(except N30)（p<0.05）during accommodation. Regarding to astigmatism, wearing SMR resulted in significantly more negative J180astigmatic component than SVSCLs (except N10at distance; except N10,0at near) or Baseline (except N10, 0) at all retinal locations (p < 0.05, p <0.001 at distance, p<0.001 at near; Sidak) either when looking at distance or near. Wearing SMR did not result in significant changes in J45astigmatic component compared with the Baseline. Wearing SMR decreased the accommodation response compared with wearing SVSCLs (p<0.0001).
Conclusions :
SMR could imposes strong myopic peripheral defocus when looking at distance. It could also maintain a certain magnitude of myopic defocus on periphery during near viewing, regardless of hyperopic effect of accommodation lag and hyperopic shift in RPRE during accommodation. The effect of SMR on adding more myopic peripheral defocus may serve a new method for controlling the progression of myopia.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.