Open Angle Glaucoma Clinical Trial
Official title:
Comparison of Visante and Cirrus Optical Coherent Tomography for Assessment of the Anterior Segment
The aim of this study is to analyze similarities and evaluate interchangeability of Visante and Cirrus OCT (optical coherent tomography)and to compare agreement between gonioscopy and the two systems for evaluation of anterior segment parameters.
All participants underwent routine ophthalmic examination by their physician. Three
independent examiners performed gonioscopy using Spaeth Gonioscopic Grading System. Findings
were recorded independently along with risk assessment of angle being closed as: high,
medium, and low or no risk. Patient information was not available to doctor during
gonioscopy. One eye of each patient was imaged using both Visante and Cirrus OCT. Imaging was
performed under scotopic and photopic conditions and obtained from horizontal (3:00 and 9:00
o'clock) and vertical (6:00 and 12:00 o'clock) meridians. The same experienced independent
examiner performed all Cirrus measurements. Visante was performed by 3 trained technicians
using same protocol.
OCT images were exported and masked to be evaluated for presence of open or closed anterior
chamber angle. Masked images were presented with no other patient information available to
two examiners with glaucoma training working together to score on basis of iridocorneal angle
as, closed (0 degree), high possibility (10 degree), medium risk (20 degree), and low or no
risk (> 30 degree).
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