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Study shows ortho-K controls axial elongation
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Orthokeratology was found to control axial elongation in certain older children with myopia when compared to single vision spectacles, according to a study recently published in Optometry & Vision Science.
In the study, 61 children were assigned to wear ortho-K contacts or single vision spectacles for 2 years. While axial length was the primary outcome measure, other factors considered included age, age of myopia onset, gender, myopia progression 2 years before baseline, baseline myopia, anterior chamber depth, corneal power and shape, iris and pupil diameters, and parental refraction, according to the study abstract.
Univariate analyses found smaller increases in axial length in the ortho-K lens wearers in older females with earlier myopia onset; in those who had a slower rate of progression and less myopia before baseline; in those with longer anterior chamber depth, more prolate corneal shape and greater corneal power; in those with larger iris diameter and pupil sizes; and in those with lower levels of parental myopia.
The researchers reported that multivariate analyses found that older age and greater corneal power were associated with smaller increases in axial length in the children who wore ortho-K lenses, while smaller iris diameter was associated with smaller increases in axial length in those who wore single vision spectacles.
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