Abstract
Purpose :
To compare the effect of four optical corrections (orthokeratology lens, multifocal soft contact lens, single-vision soft contact lens, single-vision spectacles) on accommodation of myopic children.
Methods :
30 myopic children aged 8 to 13 participated in this study. Four optical corrections, single-vision spectacles (SP), single-vision soft contact lens (SCL), multifocal soft contact lens (MSCL) and orthokeratology lens (Ortho-K), were tested, each on a separate day. Dynamic ASRC, ocular aberration, corneal topography and contrast visual acuities (100% high-contrast VA and 10% low-contrast VA) were measured after adaptation to each lens correction. Repeated analysis of variance was used to analyze the differences in accommodative parameters among the four corrections. Generalized estimating equation adjusting the impact of different corrections was used to find the potential factors for the alteration of accommodation.
Results :
Low-contrast VA was different among four corrections (F=8.243, P<0.001), and vision acuity with MSCL worsened than the conditions with SCL (P<0.001) and SP (P=0.001). Low-contrast VA was related to coma (r=0.46, P<0.001) and trefoil (r=0.14, P=0.03). No difference in high-contrast VA among four corrections was found (F=1.193, P=0.285). The area of accommodative lag (ALA) was different among four corrections (F=26.787, P<0.001). The ALA of MSCL and Ortho-K was the least, followed by SCL, and the ALA of SP was the greatest. The ALA was negatively related to corneal multifocality (r=-0.25, P<0.05), but not related to aberration. The objective accommodative amplitude was different among four corrections (F=11.711, P<0.001). It was the smallest when corrected by SP (P<0.05), and there weren’t any differences among MSCL, Ortho-K and SCL (P>0.05). Objective accommodative amplitude was positively associated with corneal multifocality (r=0.196, P<0.05), and negatively related to trefoil (r=-0.2044, P<0.05).
Conclusions :
MSCL and Ortho-K lenses reduce accommodative lag and improve objective accommodative amplitude, which might be due to the increase of corneal multifocality. MSCL impaired the low-contrast VA. Compared with SP, SCL could also decrease accommodative lag and increase objective accommodative amplitude.
This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.