Orthokeratology practice in children in a university clinic in Hong Kong*

Abstract

Purposes:The aim of this study was to analyse clinical data of children undergoing orthokeratology (ortho-k) and to investigate patients'/parents' perspective on ortho-k via telephone interviews. Methods: Clinical records of children undergoing ortho-k from a university optometry clinic were reviewed and the effects of ortho-k on refraction, vision and cornea were investigated. A telephone interview was conducted to solicit patients'/parents' perspective of the treatment. Results: One hundred and eight files were reviewed. Median age of the children was nine years (range six to 15); mean (ϮSD) pre-treatment refractive sphere was -3.56 Ϯ 1.49 D and the median refractive cylinder was -0.50 D (range zero to -4.25 D). Significant refractive spherical reduction (58 per cent), improvement in unaided vision and corneal topographical changes were noted after only one night of wear. No significant change in astigmatism was found. Corneal staining was the most commonly observed complication with ortho-k and more than 80 per cent of patients were advised to apply ocular lubricants to loosen the lens before lens removal. Ortho-k was mainly undertaken for myopic control and about 90 per cent of the respondents reported good/very good unaided vision after ortho-k and ranked the treatment as satisfactory or very good. Lens binding and ocular discharge were the most frequently reported problems during the treatment. Conclusion: Under close monitoring, overnight ortho-k is effective and safe for reducing low to moderate myopia and the treatment is well accepted by the children.

Stabilizing Myopia by Accelerating Reshaping Technique (SMART)-Study Three Year Outcomes and Overview

“…80.5% of subjects were successfully fit with the initial empirically fit lens, an additional 15% were successful with only one lens change, 4% more with a second lens change and the remaining 0.5% with a third lens change. Our results of high first lens fitting success are in agreement with the outcomes of Chan [41] who reported a first lens fitting success of 73.5% and second lens success of 90.0%. Experience in fitting of the corneal reshaping lens design did not seem to have any influence on the success of empirical fitting based on the fact that eight of the ten investigators had no clinical experience in fitting the Emerald lens design prior to participating in the SMART study.…”

“…Several studies have focused exclusively on young people and have concluded that corneal reshaping has great promise as an effective method of controlling myopia progression [3,[40][41][42][43][44]. Changes in axial length (AL) and vitreous chamber depth (VCD) appear to be the important anatomic factor to control myopia progression Cho et al [45] monitored AL and VCD over a two year period with 35 children aged 7-12; this group was compared to a spectacle-wearing control group from a previous study.…”

Evaluation of Overnight Orthokeratology For Correction of Myopia

“…The visual recovery after application of orthokeratology lens was statistically highly significant. Similar result has been reported in various studies in different ethnic communities [8][9][10][11]. There were 6 patients in 8-12 year age group and 8 between 13 to 17 years.…”

“…Certain adverse effects have been reported in literature. Corneal staining has been most commonly observed which improved with ocular lubricants [14]. Central punctate staining was observed in 2 out of 40 eyes which also improved with ocular lubricants.…”

Myopia Control with Orthokeratology Contact Lenses in Spain (MCOS): Study Design and General Baseline Characteristics

“…Subjects and parents engaged enthusiastically in the study and responded well to initial introduction of the study design and protocol. The number of contact lenses required to achieve an optimum fit were either lower than 31 or similar to 32 those reported in previous studies.…”