Observation of orthokeratology discontinuation

OBJECTIVE: To observe the change of teenagers with short-time and long-time orthokeratology discontinuation, including diopters, corneal curvature, corneal topography, axial length, and central corneal thickness, and to investigate the refractive correction methods after long-time orthokeratology discontinuation. METHODS: Retrospective study. A total of 141 patients (257 eyes) with a history of wearing and discontinuing wearing orthokeratology lenses in our center were collected. According to the spherical equivalent diopters, the patients were divided into two groups ( 0.05) The average annual spherical growth was (-0.08 +/- 0.17) D, (-0.12 +/- 0.17) D, (-0.07 +/- 0.19) D, and (-0.15 +/- 0.16) D, respectively, for the four sub-groups, and there was no statistically significant difference among them (F = 1.180, P > 0.05). Compared to the state before wearing orthokeratology lenses, the corneal curvature measured by an autorefractor was statistically different for groups I A and I A, but not statistically different for groups I B and II B. For the long-time discontinuation groups, only the SRI of the corneal topography had a statistically significant decrease compared to the value before wearing orthokeratology lenses, and others had no significant change. The average annual increase of axial length was (0.22 +/- 0.16) mm and (0.16 +/- 0.10) mm for groups IA and IB, respectively, and the increase was statistically significant (P 0.05). The central corneal thickness had no significant change (t = 1.971, 2.017, P > 0.05). The rates of the refractive correction methods after long-time discontinuation were 36.7%, 22.4%, 22.4%, 12.4%, and 6.1% for spectacles, rigid gas permeable contact lenses, soft contact lenses, either spectacles or soft contact lenses, and refractive operations, respectively. CONCLUSION: The corneal morphology and central corneal thickness returned to the original after three months of discontinuation of orthokeratology. The myopia had no significant growth after discontinuation, and there was no significant difference between low to moderate and relatively high myopia.