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Pupil size in relation to ultrasonic anterior chamber depth measurements in pseudophakic eyes
Authors:E P Rabie  N Jacobs
Affiliation:1. Department of Ophthalmology, Shandong Provincial Hospital, Shandong University, Jinan, China;2. Department of Ophthalmology, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China;1. School of Chemistry and Chemical Engineering, Henan Institute of Science and Technology, Xinxiang, Henan Province, China;2. Industrial Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia;3. Chemical Engineering Department, Khalifa University of Science and Technology, P.O. Box 127788, Abu Dhabi, United Arab Emirates;4. Center for Catalysis and Separations, Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates;5. Geology Department, Faculty of Science, Beni-Suef University, Beni-Suef 65211, Egypt;6. Materials Technologies and their Applications Lab, Geology Department, Faculty of Science, Beni-Suef University, Beni-Suef City, Egypt;1. Woodruff School of Mechanical Engineering, Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA, USA;2. Biomedical Engineering Research Division, University of Glasgow, Glasgow, UK;1. King Faisal Specialist Hospital & Research Centre (KFSHRC) - Jeddah, Oncology Department, Radiation Oncology Section, P.O Box 40047, 21499, Jeddah, Saudi Arabia;2. King Abdul Aziz University Hospital, Department of Radiology Department, P.O Box 21589, Jeddah, Saudi Arabia;3. Cairo University, Department of Clinical Oncology, Faculty of Medicine, Cairo, P.O Box 11562, Cairo, Egypt;4. Sohag University Hospital, Department of Clinical Oncology, Sohag, P.O Box 82524, Egypt
Abstract:The effect of pupil size on ultrasonically determined anterior-chamber depth was studied in vitro with the Storz Alpha 20/20 and with the Kretz ultrasonoscope at high and low system sensitivity. The traces were measured peak to peak and base to base; results were compared to anterior-chamber depth measurements with optical pachymetry. We conclude that when measuring anterior-chamber depth with ultrasound, the pupil must be fully dilated or reduced system sensitivity must be used and the traces measured peak to peak.
Keywords:anterior chamber depth  A-scan ultrasonography  pachymetry  peak-to-peak measurement  pseudophakia  pupil diameter  system sensitivity
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