Author(s): Oh J, Shin HH, Kim JH, Kim HM, Song JS
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Abstract PURPOSE: To measure the ciliary sulcus diameters in 4 different axes and to determine the correlation with white-to-white distance. DESIGN: Cross-sectional observational study. PARTICIPANTS: Fourteen normal volunteers with no evidence of ocular disease. METHODS: Twenty-eight eyes were scanned using a 35-megahertz (MHz) ultrasound biomicroscopy (UBM) in sequential meridional scan planes at 45 degrees increments. Horizontal white-to-white distance was measured using Orbscan IIz (Bausch & Lomb-Orbtek, Inc., Salt Lake City, UT). MAIN OUTCOME MEASURES: Ciliary sulcus diameter, anterior chamber diameter, white-to-white distance, and coefficient of variation. RESULTS: The coefficient of variation for 35-MHz UBM was 0.90\%. The mean diameters+/-standard deviations of ciliary sulci were 11.55+/-0.38 mm at 45 degrees, 11.99+/-0.36 mm at 90 degrees, 11.54+/-0.36 mm at 135 degrees, and 11.32+/-0.40 mm at 180 degrees. In all eyes, vertical diameters were greater than horizontal diameters. The mean difference between vertical and horizontal diameters was 0.67+/-0.26 mm (range, 0.36-1.13 mm), and this was statistically significant (P<0.001). Horizontal sulcus diameters and horizontal white-to-white distances were not correlated (r = 0.006; P = 0.976). CONCLUSIONS: The posterior chamber appears to have a vertically oval shape. The white-to-white technique is inaccurate at predicting the horizontal diameter of the ciliary sulcus. The 35-MHz UBM may provide a good means of measuring the ciliary sulcus diameter for the implantation of a posterior chamber phakic intraocular lens.
This article was published in Ophthalmology
and referenced in Journal of Clinical & Experimental Ophthalmology