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Published on: July 24, 2020
Anterior ocular biometry using 3-dimensional optical coherence tomography.
Shinichi Fukuda1, Keisuke Kawana, Yoshiaki Yasuno
1Department of Ophthalmology, Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, Japan. Caesar.ShihTzu@gmail.com
Ophthalmology
|May 5, 2009
Summary
Three-dimensional corneal and anterior segment optical coherence tomography (CAS-OCT) provides comparable central corneal thickness (CCT) and anterior chamber depth (ACD) measurements to other methods, except for Scheimpflug camera CCT readings.
Area of Science:
- Ophthalmology
- Biometry
- Medical Imaging
Background:
- Accurate anterior ocular biometry is crucial for ophthalmic diagnostics and surgical planning.
- Comparing measurement devices for central corneal thickness (CCT) and anterior chamber depth (ACD) ensures reliable clinical data.
- 3-dimensional corneal and anterior segment optical coherence tomography (CAS-OCT) offers a novel approach to ocular biometry.
Purpose of the Study:
- To evaluate anterior ocular biometry by comparing CCT and ACD measurements obtained via CAS-OCT with established methods.
- To assess the repeatability and reproducibility of CAS-OCT measurements for CCT and ACD.
- To determine the anterior chamber volume (ACV) using CAS-OCT.
Main Methods:
- A cross-sectional study involving 40 eyes of 40 normal subjects.
- Central corneal thickness (CCT) was measured using CAS-OCT, Scheimpflug camera, scanning-slit topography, and ultrasonic pachymetry.
- Anterior chamber depth (ACD) was measured using CAS-OCT, Scheimpflug camera, and scanning-slit topography. Anterior chamber volume (ACV) was calculated with CAS-OCT. Repeatability and reproducibility were assessed.
Main Results:
- CAS-OCT, ultrasonic pachymetry, and scanning-slit topography showed comparable CCT measurements; Scheimpflug camera yielded significantly higher CCT values (P<0.0001).
- No significant differences were found in ACD measurements among CAS-OCT, Scheimpflug camera, and scanning-slit topography (P = 0.678).
- CAS-OCT demonstrated high repeatability and reproducibility for CCT and ACD measurements (repeatability <5%, ICC >0.98) and calculated ACV as 169.7+/-23.1 mm³.
Conclusions:
- CAS-OCT provides reliable CCT and ACD measurements comparable to other standard methods, with the exception of Scheimpflug camera CCT.
- CAS-OCT offers a non-invasive method for accurately measuring anterior chamber volume (ACV).
- The high repeatability and reproducibility of CAS-OCT support its clinical utility in anterior segment biometry.
