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FERRIS STATE STUDY - SEEOMC- Safety and efficacy of overnight Orthokeratology in myopic children
iGO SUMMARY: This US study involved 16 short-sighted children aged from 10 to 16 who underwent Overnight Vision Correction (OVC) treatment using i-GO OVC lenses and were evaluated at different intervals over a six month period. At study commencement, the average prescription was over two diopters and this had reduced to less than one-fifth of a diopter after six months. The study also demonstrated that this substantial reduction in short-sightedness was effectively achieved in just one week of i-GO OVC lens wear and held steady throughout the subsequent assessment period. Additionally, no material safety issues were identified during the study.
ABSTRACT: BACKGROUND: This prospective case series was conducted to describe the safety and efficacy of
Orthokeratology with the EmeraldTM Contact Lens for Overnight Orthokeratology (Oprifocon A; Euclid
Systems Corporation, Herndon, Virginia) among young myopes.
METHODS: Twenty subjects (ages 10 to 16) were enrolled in the 6-month pilot study. Subjects were fit
empirically with overnight Orthokeratology lenses and evaluated at 1 day, 1 week, 1 month, 2 months,
3 months, and 6 months.
RESULTS: Sixteen subjects completed the study. The mean baseline spherical equivalent refraction
(SER) was 2.06 diopters (D) (0.75). The mean SER at 6 months was 0.16 D (0.38). The mean
baseline uncorrected acuity was 0.78 (0.28) logarithmic minimum angle of resolution (logMAR)
equivalent (20/100 Snellen). The mean logMAR equivalent at 6 months was 0.03 0.12 (20/20
Snellen). On average, 40% of eyes showed some type of corneal staining between the 1-week and
6-month visits. No serious adverse events occurred during the study.
CONCLUSION: In contrast to previously published studies that reported maximum results at 2 weeks,
subjects reached maximum reduction in myopia at the 1-week visit and, on average, obtained a 92.2% reduction in spherical equivalent refractive error at 6 months. This pilot study lends to a growing body
of evidence that short-term correction of mild to moderate myopia with overnight orthokeratology is
safe and efficacious in children and adolescents.
Optometry 2007;78:225-231
May 2007,Optometry, Michigan College of Optometry, Ferris State University, Big Rapids, Michigan., Renée Mika, O.D., Bruce Morgan, O.D., Michael Cron, O.D., Josh Lotoczky, O.D., and John Pole, O.D., M.S.
Michigan College of Optometry, Ferris State University, Big Rapids, Michigan.
For full article go to: FERRIS STATE STUDY - SEEOMC- Safety and efficacy of overnight Orthokeratology in myopic children
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