Short-Term Effects of Various Contact Lenses on Accommodative Function in Myopic Children

Purpose: To assess the short-term impact of different types of contact lenses on accommodation in the same group of myopic children compared with single-vision spectacle lenses. Methods: Thirty myopic children aged 10.2 ± 1.5 years were enrolled. Each participant was corrected with four different modalities in following sequence: single-vision spectacles (SVSP), single-vision soft contact lens (SVSCL), a high-addition multifocal soft contact lens (MFSCL), and orthokeratology lenses (OKL). Measurements included the dynamic accommodative stimulus–response curve (ASRC), distance accommodative facility (DAF), negative relative accommodation (NRA), and positive relative accommodation (PRA). Repeated-measures analysis of variance with Bonferroni correction was performed. Results: The accommodative parameters differed among the four modalities except for the slope of ASRC ( F = 1.700, P = 0.173). Single-vision spectacle lens exhibited the highest accommodative lag area (10.08 ± 1.65 D 2 ) and the lowest objective accommodative amplitude (7.72 ± 0.93 D) and PRA (−2.51 ± 0.62 D) (all P < 0.05). Multifocal soft contact lens, OKL, and SVSCL showed no significant differences in accommodative lag area (8.93 ± 1.78, 7.98 ± 2.33, 8.44 ± 2.20 D 2 ), NRA (2.23 ± 0.33, 2.23 ± 0.38, 2.39 ± 0.33 D), PRA (−3.05 ± 0.78, −3.43 ± 1.05, 3.00 ± 1.02 D), or DAF (23.8 ± 6.99, 26.0 ± 8.23, 23.3 ± 7.07 D); however, OKL (8.68 ± 1.08 D) induced greater objective accommodative amplitude than SVSCL (8.26 ± 0.97 D) ( P = 0.010). Conclusion: Single-vision spectacles exhibited worse accommodative function than the other three modalities. However, no significant changes in accommodation were detected when using OKL or high-addition MFSCL compared with SVSCL, except higher objective accommodative amplitude with OKL than SVSCL.