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Patrick Simard, Langis Michaud, Rémy Marcotte-Collard; Predictive factors for 12 months axial growth with customized orthokeratology (3MOD). Invest. Ophthalmol. Vis. Sci. 2020;61(7):80.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the predictive factors for 12 months axial length with customized orthokeratology lens design on a population of myopic patients
This is a retrospective analysis of patients consulting at Clinique Universitaire de la Vision, Université de Montréal and for whom a myopia control strategy was initiated. This study was conducted after formal approval by internal review board (ethics committee) and Commission de L’accès à l’Information, responsible for the protection of personal data and information. More specifically, the chart of every young (< 20 y.o.) myopic (>-0.50D at baseline) patient fitted with customized orthokeratology between 2017 and 2019, and followed for at least 12 months, was reviewed. Customized orthokeraology means that the lens parameters was fully adapted to paitent’s ocular parameters, including pupil size.To evaluate the predictive value of initial axial length, age at the start of treatment, peripheral net power on the cornea, far horizontal optic zone, far vertical optic zone and axial length at 1 month, two groups of patients were created based on the control effect of the axial length at 12 months and only the right eye was analysed. A T-test between the two groups was run for each attribute.
The study was made on 112 subjects, 40 boys (18 Caucasian and 22 Asian) and 72 girls (24 Caucasian and 48 Asian), aged 11.6 ± 2.2 years old. Lenses were worn for 7 days a week, at least 8 h00 overnight, and subjects had been followed for at least 12 months.For the right eye at 12 months, 49 eyes had -0.107±0.097mm reduction in axial length and 63 eyes had 0.197±0.146mm elongation. The age at the start of treatment and the axial length at 1 month was predictive of shorter axial length at 12 months (p<0.001). Initial axial length, peripheral net power on the cornea, far horizontal optic zone and far vertical optic zone were not significant.
Customizing Orthokeratology design seems to be more effective in older patient. Age at the start of treatment and axial length reduction at 1 month are predictive of axial length control at 12 months. Results suggest a constant treatment effect accross age.
This is a 2020 ARVO Annual Meeting abstract.
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