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The Influence of Overnight Orthokeratology on the Ocular Surface and Meibomian Glands in Children and Adolescents |
Li Yang, Pingping Yu |
The Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310005, China |
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Abstract Objective: To investigate the effect of overnight orthokeratology (OOK) on the ocular surface and changes in meibomian gland morphology in children and adolescents with myopia. Methods: In this prospective cohort study, choosing myopia children from the Second Affiliated Hospital of Zhejiang Chinese Medical University, sixty myopic patients (60 eyes) with OOK were selected as the OOK group, and 60 patients (60 eyes) with eye glasses were selected as the glasses group. The following tests were performed before OOK and eyeglass wear and after 1, 3, 6 and 12 months of wear. Tests included ocular surface disease index (OSDI) questionnaire, noninvasive tear break-up time (NIBUT), tear meniscus height (TMH), corneal epithelial staining (CSF), and meiboscore using noncontact meibography. The effect of OOK wear on the ocular surface and changes that occurred were evaluated and summarized by comparing the differences between these two groups. Results: There were no significant differences in the OSDI score or tear meniscus height between these two groups. The NIBUT of the OOK group showed a significant decrease after 6 and 12 months of lens wear (both P<0.05). There were no statistically significant differences at other time points. Corneal fluorescence staining in the OOK group increased after wearing the lenses (χ2 =19.511, P=0.013), but there were no statistically significant differences at the other time points. The score of the meibomian gland orifice in the OOK group was slightly increased before wearing the lenses and after 1, 3 and 6 months, but the differences were not statistically significant. The final 12 months were significantly higher than before wearing eye glasses and 1 month after wearing eye glasses, and the difference was statistically significant (P<0.05). Conclusions: It is relatively safe to wear OOK lenses overnight. Shortterm wear of OOK will not cause discomfort and it will not reduce tear meniscus height or the amount of tear secretion in the short term, however, it reduces the stability of the tear film and increases the corneal fluorescence staining score. OOK lens wear affected meibomian gland function. In particular, the upper meibomian gland changed first.
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Received: 17 May 2019
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Fund: Medical Health Science and Technology Project of Zhejiang Provincial Health Commission (2018ZH018) |
Corresponding Authors:
Pingping Yu, the Second Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou 310005, China (Email: yppjs1971@163.com)
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