Changes in Ciliary Sulcus Size, Anterior Chamber Depth and Angle during Accommodation using Ultrasound Biomicroscopy

PURPOSE: To evaluate changes in the ciliary sulcus size, anterior chamber depth (ACD) and anterior chamber angle (ACA) during accommodation using an ultrasound biomicroscope (UBM). METHODS: Twenty-seven eyes of 27 healthy subjects were studied. We examined refractive error and intraocular pressure, measured the horizontal distance of the ciliary sulcus, ACD, and ACA at distant fixation and near fixation using a UBM (50 MHz transducer, model P45 UBM plus, Paradigm(R), Kent, U. K.). RESULTS: The subjects included 16 males and 6 females. The mean age of the subjects was 20.5 years (age range, 19-22 years), and mean spherical equivalent was -2.86+/-1.67 diopters. At distant fixation, horizontal ciliary sulcus size was 11.75+/-0.56 mm, ACD was 3.15+/-0.17 mm, and ACA was 38.5+/-4.2 . At near fixation, horizontal ciliary sulcus size was 11.34+/-0.65 mm, ACD was 2.92+/-0.15 mm, and ACA was 44.5+/-5.7 . CONCLUSIONS: During accommodation, horizontal ciliary sulcus size and ACD significantly decreased and ACA increased in the patients.

Ciliary Sulcus Size according to Refractive Error using Ultrasound Biomicroscopy

PURPOSE: To evaluate the correlation between the size of ciliary sulcus and ocular measurements such as anterior chamber depth, axial length and limbus size, we measured anterior chamber depth, axial length, corneal thickness, corneal limbus size and ciliary sulcus size. We also evaluated the difference in ciliary sulcus size according to the refractive errors. METHODS: Forty eyes of twenty patients were subdivided into three groups after refraction: high myopia (>or= 6 diopter; 13 eyes), moderated myopia (>or= 3 diopter, < 6 diopter; 17 eyes), and low myopia (< 3 diopter; 10 eyes). We measured the anterior chamber depth using ultrasound biomicroscopy (UBM), and calculated the size of the ciliary sulcus by mapping method. We measured the axial length with ultrasonography, the size of limbus with calipers, and performed corneal topography. RESULTS: Vertical ciliary sulcus sizes were 12.2 +/- 0.6 mm, 12.2 +/- 0.5 mm, and 11.8 +/- 0.5 mm, while horizontal ciliary sulcus sizes were 11.8 +/- 0.6 mm, 11.9 +/- 0.4 mm, and 11.6 +/- 0.6 mm, in the high, moderate and low myopia groups, respectively. There were no significant differences between groups. Horizontal ciliary sulcus size was most positively correlated with anterior chamber depth among the ocular measurements(Pearson r=0.46). CONCLUSIONS: There were no significant correlations between ciliary sulcus size and anterior chamber depth, axial length and limbus size, and there were no differences in the ciliary sulcus size according to the refractive errors.