Correlation between ciliary sulcus diameter measured by 35 MHz ultrasound biomicroscopy and other ocular measurements.
OBJECTIVE
To measure horizontal ciliary sulcus diameters by 35 MHz ultrasound biomicroscopy (UBM) and evaluate correlations between these and other ocular measurements.


METHODS
Department of Ophthalmology, Korea University College of Medicine, Seoul, Republic of Korea.


METHODS
A pilot group comprising 20 eyes of 10 patients was enrolled in a prospective trial. Horizontal sulcus diameter was measured using a 35 MHz UBM unit; other ocular measurements (eg, corneal curvature, refractive error, white-to-white [WTW] distance, anterior chamber depth [ACD]) were also taken in all patients. Linear regression analysis was used to evaluate the correlation between horizontal sulcus diameter and the other measurements. A regression equation was determined as a result of the analysis and applied to a second validation group (14 eyes).


RESULTS
The mean horizontal diameter of the ciliary sulcus in the pilot group was 11.56 mm +/- 0.64 (SD). The mean corneal curvature was significantly and negatively correlated with the horizontal sulcus diameter (P<.001). Refractive error, ACD, and horizontal WTW diameter were not correlated with the horizontal sulcus diameter by multiple regression analysis. In the validation group, sulcus diameters estimated using the regression equation were significantly correlated with actual values, and these 2 sets of values were not statistically different.


CONCLUSIONS
Mean corneal curvature was significantly and negatively correlated with horizontal sulcus diameter. The derived regression formula based on mean corneal curvature measurements may help predict sulcus diameters for proper sizing of posterior chamber phakic intraocular lenses.
Kim
Kyun-Hyung
KH
Department of Ophthalmology, Korea University College of Medicine, 80 Guro-dong, Guro-gu, Seoul, Republic of Korea.
Shin
Hyung-Ho
HH
Kim
Hyo-Myung
HM
Song
Jong-Suk
JS
D000328:Adult; D000867:Anterior Chamber / Q000000981:diagnostic imaging*; D001837:Body Weights and Measures; D002924:Ciliary Body / Q000000981:diagnostic imaging*; D003315:Cornea / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D019654:Lens Implantation, Intraocular; D008297:Male; D033401:Microscopy, Acoustic / Q000379:methods*; D011446:Prospective Studies; D012030:Refractive Errors / Q000000981:diagnostic imaging*