Yanchun Xu, F. Gu, Fu-sheng Zhang, Huan-yun Yu, Chun-lei Liu
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Positive relative accommodation increase produced in response to overnight orthokeratology
Objective
To observe the changes of accommodation with myopia adolescents after wearing orthokeratology, and to investigate the mechanism of orthokeratology controlling myopia progression.
Methods
A total of 110 adolescents with myopia, 43 adolescents were emmetropia, 48 patients wore orthokeratology. Phoria at distance and near, positive relative accommodation and negative relative accommodation (PRA/NRA) were measured with phoropter, and compared with the patients wearing frame glasses. The PRA and NRA before and after wearing orthokeratology in 19 patients were compared.
Results
The PRA after 3 months wearing orthokeratology group (-4.32±1.59)D were much higher than the patients wearing frame glasses (-2.27±1.19)D. There was significant difference in PRA (P<0.05). There was no significant difference in NRA. The PRA after wearing orthokeratology (-4.22±1.67)D were higher than the PRA before wearing orthokeratology (-2.49±1.05) D, there was significant difference (P <0.05).
Conclusions
The PRA is increased after wearing orthokeratology, the accommodation is increased, and it may be the reasonable mechanism of orthokeratology controlling myopia progression.
Key words:
Myopia; Orthokeratology; Positive relative accommodation
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