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chunwen tao, Jingjing Xu, Xin lu, Jinhua Bao, Bjorn Drobe, Hao Chen; The influence of orthokeratology on blur detection threshold and accommodation in myopic children.. Invest. Ophthalmol. Vis. Sci. 2017;58(8):5425.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the variation of blur detection thresholds (BDT) and the lag of accommodation before and after wearing orthokeratology lenses in myopic children.
Twenty-two myopic children of 8-14 years old (spherical equivalent：-1.00D to -5.75D with astigmatism ≤0.75 D, best-corrected visual acuity ≥20/20), corrected with orthokeratology lenses, participated in this self-controlled prospective study. Their visual acuity after orthokeratology correction was not less than 20/20. The subjects’ blur detection threshold, accommodative lag, and higher-order aberrations were measured before and after one-month wearing orthokeratology lenses. All the data were analyzed with SPSS 19.0 software.
Higher-order aberrations increased significantly (t=-9.166, P<0.05) after orthokeratology correction, with higher trefoil (t=-2.716，P<0.05) and higher coma (t=-4.464, P<0.05). The BDT decreased significantly after orthokeratology correction by 0.08D (t=2.527，P<0.05). No significant change in the accommodative lag was found after wearing orthokeratology lenses (before 0.39±0.42D, after 0.19 ±0.38 D; t=1.862，P＞0.05) . There was no significant correlation between blur detection threshold and accommodative lag either before (r=-0.364. P＞0.05) or after (r=0.097, P＞0.05）orthokeratology correction. Similarly, no correlations between BDT and higher-order aberrations were found.
After orthokeratology correction, the blur sensitivity of myopic children improved while their accommodative behavior remained unchanged.
This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.
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