Abstract
Purpose To assess the effects of the 3-month period of orthokeratology (OK) treatment on corneal sensitivity in Chinese children and adolescents. Methods Thirty subjects wore overnight OK lenses in both eyes for 3 months and were assessed at baseline, 1 day, 1 week, 1 month, and 3 months after the treatment. Changes in corneal sensitivity were measured by the Cochet–Bonnet (COBO) esthesiometer at the corneal apex and approximately 2 mm from the temporal limbus. Changes in refraction and corneal topography were also measured. Results Central corneal sensitivity suffered a significant reduction within the first month of the OK treatment period but returned to the baseline level at three months (F = 3.009, P=0.039), while no statistically significant difference occurred in temporal sensitivity (F = 2.462, P=0.074). The baseline of central corneal sensitivity correlated with age (r = −0.369, P=0.045). A marked change in refraction (uncorrected visual acuity, P < 0.001; spherical equivalent, P < 0.001) and corneal topographical condition (mean keratometry reading, P < 0.001; eccentricity value, P < 0.001; Surface Regularity Index, P < 0.001) occurred, but none of these measurements were correlated with corneal sensitivity. Conclusions A 3-month period OK treatment causes a reduction in central corneal sensitivity in Chinese children and adolescents but with a final recovery to the baseline level, which might be because neuronal adaptation occurred earlier in children and adolescents than in adults.
Highlights
Myopia is the most common ocular disorder in humans [1]
Over the last decade, the effects of OK lenses on corneal morphology, biomechanical properties [5,6,7], and the occurrence of complications [8] have been widely investigated to evaluate the safety of OK treatment, but its effect on corneal sensitivity still needs further study
Discussion. e goal of this study was to demonstrate the effects of a 3-month OK treatment on corneal sensitivity in Chinese children and adolescents, and it tries to offer a reasonable explanation of the findings
Summary
Myopia is the most common ocular disorder in humans [1]. An epidemic of myopia has created a myopic prevalence in young adults in developed countries of east and southeast Asia of about 80–90%, with a 10–20% prevalence of high myopia [2]. What’s more, Nombela-Palomo et al noted a significant, but modest, decrease in central corneal sensitivity at 1-month OK treatment on adult patients [24].
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