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Assessment of central corneal thickness using optical coherence tomography
Gary R Fishman1, Mauricio E Pons, John A Seedor
1Department of Ophthalmology, New York Eye and Ear Infirmary, New York, USA.
Journal of Cataract and Refractive Surgery
|May 19, 2005
Summary
The OCT3 optical coherence tomographer accurately measures central corneal thickness in vivo, showing high correlation and agreement with ultrasound pachymetry. This noninvasive technique is reproducible for corneal evaluation.
Area of Science:
- Ophthalmology
- Biomedical Optics
- Medical Imaging
Background:
- Accurate measurement of central corneal thickness (CCT) is crucial for various ophthalmic assessments.
- Traditional methods like ultrasound pachymetry have limitations.
- Optical coherence tomography (OCT) offers a non-contact approach to corneal imaging.
Purpose of the Study:
- To evaluate the capability of the OCT3 optical coherence tomographer for in vivo central corneal thickness (CCT) measurement in normal human corneas.
- To compare OCT3 measurements with standard ultrasound (US) pachymetry and Orbscan data.
Main Methods:
- Central corneal thickness (CCT) was measured in 22 eyes using OCT3 (Carl Zeiss Meditec), Orbscan, and US pachymetry.
- OCT3 data were processed using standard software (OCT3(std)) and a custom image analysis program (OCT3(sci)).
- OCT3 and Orbscan results were compared against the mean of five US pachymetry measurements per eye.
Main Results:
- OCT3(std) and OCT3(sci) demonstrated high correlation with US pachymetry (r=0.981 and r=0.984, respectively; P<.0001).
- Bland-Altman analysis indicated good agreement between OCT3 techniques and US pachymetry, but not Orbscan.
- High repeatability was observed for both OCT3(std) (r²=0.05) and OCT3(sci) (r²=0.01) measurements.
Conclusions:
- The OCT3 optical coherence tomographer is an accurate and noninvasive method for evaluating central corneal thickness (CCT).
- The technique demonstrates high reproducibility, making it a reliable tool for ophthalmic diagnostics.
- OCT3 offers a valuable alternative for in vivo corneal thickness assessment.