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H. Mori, Y. Watanabe, Y. Yasuno, H. Goto; Novel Visualization Methods of Anterior Chamber Angle Using Three Dimensional Anterior Segment Optical Coherence Tomography. Invest. Ophthalmol. Vis. Sci. 2008;49(13):5079.
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To demonstrate a visualization methods of anterior chamber angle using three-dimensional cornea and anterior segment optical coherence tomography (3-D CAS-OCT).
A prototype of 3-D CAS-OCT(TOMEY Corporation, Aichi, Japan) using a probe wavelength of 1,300nm based on swept-source OCT was emplyed in this study. The measurement range was 16 mm×16 mm, and a raster-scanning protocol with 256A-scans×256 B-scans was used. The scanning rate was 20,000 A lines/s, and the acquisition time for a three-dimensional tomography is 3.3s. Total 20 eyes of 18 patients with normal angle, narrow angle, corneal opacities and corneal grafting were examined. A custom made 3-D visualization protocols was applied to the 3-D tomograms obtained. These imaging protocols enables 360 degree rotating tomographic observation of the angle (rotation view) and 360 degree rotating imitate gonioscopic observation of the angle (gonioscopic view).
All 20 of 20 eyes, anterior chamber angles were clearly visualized by both of the rotation and the gonioscopic view. In particular, peripheral anterior synechia could be readily detected in the narrow angle cases. The methods clearly visualized the angle of the eye with severe corneal opacities, although standard gonioscope was not able to access the angles.
The novel visualization methods of anterior chamber angle using 3-D CAS-OCT allows entire angle observation readily. These visualization methods successfully accessed the cases which was difficult to be examined by conventional gonioscopy.
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