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Decrease in intraocular pressure following orthokeratology measured with a noncontact tonometer.
Yasuhito Ishida1, Ryoji Yanai2, Takeshi Sagara1
1Department of Ophthalmology, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi, 755-8505, Japan.
Japanese Journal of Ophthalmology
|May 17, 2011
Summary
Orthokeratology treatment for myopia significantly lowers intraocular pressure (IOP) measurements. This reduction is likely due to the thinning of central corneal thickness (CCT) caused by orthokeratology lenses.
Area of Science:
- Ophthalmology
- Optometry
- Corneal Physiology
Background:
- Orthokeratology corrects myopia by altering corneal shape.
- Corneal properties like thickness and curvature influence intraocular pressure (IOP) readings.
- The effect of orthokeratology on IOP measurements needs clarification.
Purpose of the Study:
- To investigate how orthokeratology affects intraocular pressure (IOP) measurements.
- To determine the relationship between orthokeratology-induced corneal changes and IOP readings.
Main Methods:
- Prospective interventional case series involving 45 subjects over 52 weeks.
- Subjects wore overnight orthokeratology lenses.
- Measurements included visual acuity, refraction, IOP, central corneal thickness (CCT), and corneal curvature.
Main Results:
- Orthokeratology significantly reduced uncorrected visual acuity, myopia (spherical equivalent), IOP, and CCT.
- Corneal curvature flattened significantly after treatment.
- The decrease in IOP was significantly correlated with the decrease in CCT.
Conclusions:
- Orthokeratology treatment for myopia results in a measurable decrease in IOP.
- This IOP reduction is likely attributed to the thinning of central corneal thickness (CCT) induced by orthokeratology.
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