Title of article :
Orthokeratology in Moderate Myopia: A Study of Predictability and Safety
Author/Authors :
Singh, Kirti Guru Nanak Eye Centre - Maharaja Ranjit Singh Marg - New Delhi - India , Bhattacharyya, Mainak Guru Nanak Eye Centre - Maharaja Ranjit Singh Marg - New Delhi - India , Goel, Abhishek Guru Nanak Eye Centre - Maharaja Ranjit Singh Marg - New Delhi - India , Arora, Ritu Guru Nanak Eye Centre - Maharaja Ranjit Singh Marg - New Delhi - India , Gotmare, Nikhil Guru Nanak Eye Centre - Maharaja Ranjit Singh Marg - New Delhi - India , Aggarwal, Himshikha Guru Nanak Eye Centre - Maharaja Ranjit Singh Marg - New Delhi - India
Abstract :
Purpose: Literature is relatively silent on safety profile and predictability of orthokeratology lenses in terms of myopia correction and prevention of further progression, especially in semi-tropical countries; this study was designed to fill this gap.
Methods: This prospective, intervention case series enrolled 30 eyes of 30 patients
with myopia up to –5.5 diopters (D). Patients were randomized into two groups of 15
each; the study group was prescribed overnight orthokeratology (OK) lenses, while the
control group used daily wear conventional soft contact lenses. Follow-up examinations
were performed after 1 h and 6 h, and then at 1, 7, 15, 30 days, and 4 months post lens
wear. Uncorrected visual acuity (UCVA), contrast sensitivity, keratometry, central corneal
thickness (CCT), and tear film break up time (TBUT) were evaluated at each follow-up
examination.
Results: All patients attained a visual acuity of 0.00 Logarithm of the Minimum Angle
of Resolution (logMAR) after one week of lens use, which was maintained throughout
the study period. While patients allotted to the study group had a gain of 8.1 Snellen
lines (UCVA), those in the control group gained 8.9 lines (BCVA) at the end of follow-up
period. In the OK group, cornea showed a flattening of 0.8 D (mean keratometry) after
single overnight usage of OK lens and overall flattening of 1.2 D compared to baseline, at
the end of four months. The change in contrast sensitivity, corneal endothelial specular
count, axial length and tear film status was not significant in either group.
Conclusion: Orthokeratology is an effective and safe modality to correct moderate
myopia in motivated young adults. No side effects were encountered after a short-term follow-up in participants who resided in semi-tropical environments.
Keywords :
Contact Lens , Overnight Wear , Orthokeratology , Moderate Myopia , Semi-tropical Environments
Journal title :
Journal of Ophthalmic and Vision Research