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AIM: To determine the correlation among horizontal ciliary sulcus(HCS)diameter, vertical ciliary sulcus(VCS)diameter and corneal diameter in different anterior chamber depth(ACD)levels from patients with low to moderate myopia.METHODS: Retrospective study. A total of 78 patients(129 eyes)with low to moderate myopia who had preoperative examination of implantable contact lens(ICL)implantation in Shanghai Bright Eye Hospital from April 2021 to April 2022 were included. HCS, VCS and white to white(WTW)were measured and compared. Patients were divided into shallow ACD group(2.8 mm ≤ ACD ≤3.2 mm), medium ACD group(3.2 mm < ACD ≤3.4 mm)and deep ACD group(ACD > 3.4 mm)based on the ACD obtained by Pentacam. The HCS, VCS and WTW within and among groups were compared, and the correlation of WTW, HCS and VCS among each group was analyzed by Pearson and linear regression equation.RESULTS: There was no statistical difference in WTW and HCS overall and in groups with different ACD(P>0.05), while there was difference between VCS and both HCS and WTW(P<0.01). The WTW had a correlation with both HCS and VCS in each group, while correlation between WTW and VCS was weak in the deep ACD group(r=0.470, R2=0.221, P<0.01). Furthermore, the WTW, HCS and VCS in the shallow ACD group were statistically different from those in the medium and deep ACD groups(P<0.01).CONCLUSION: The WTW was suggested predicting HCS rather than perfectly replacing HCS before patients had the ICL operation among patients with low to moderate myopia. The predictability of VCS would decline as the ACD depth increasing, predicting VCS by WTW was not recommended.
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@#AIM: To investigate the correlation between horizontal corneal diameter(WTW), horizontal anterior chamber diameter(HACD)and horizontal ciliary sulcus diameter(S-S). <p>METHODS: A total of 62 cases(115 eyes)with high myopia were collected from those who were examined in our hospital from August 2015 to August 2016. Their WTW and HACD were measured with SIRIUS, while S-S was measured with UBM, and the results were compared and analyzed. <p>RESULTS: In all patients, WTW was 11.91±0.37mm, HACD was 12.45±0.43mm, S-S was 11.78±0.46mm. There was negative correlation between HACD or S-S and age(<i>r</i>=-0.423 and <i>r</i>=-0.386 respectively, all <i>P</i><0.05). Correlation comparison with central anterior chamber depth(ACD)showed in group with ACD≤3.5mm, WTW and HACD were related with S-S; while in group with ACD>3.5mm, there was no significant correlation between WTW or HACD and S-S. <p>CONCLUSION: 1)WTW and S-S has better correlation, but due to the influence of age and anterior chamber depth, S-S is recommended to be measured with reference to the UBM to determine ICL when the patient is equal to or over 40 years old or with ACD>3.5mm; 2)SIRIUS Anterior Segment System is safe, simple and repeatability in measuring WTW and HACD.
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Objective@#To measure the ciliary sulcus diameters (CSD) in phakic eyes of adult Filipinos using ultrasound biomicroscopy (UBM).@*Methods@#This was an observational, cross-sectional study involving Filipino patients recruited from the Outpatient Department of Makati Medical Center, Philippines from September 2006 to December 2006. Vertical and horizontal CSDs in phakic eyes were measured using a UBM Scan 1000 (Ophthalmic Technologies Inc., Toronto, Ontario, Canada). Three repeated measurements of each meridian were taken and averaged. The average CSD for each eye was computed as the average of the horizontal and vertical CSDs. Student’s t-test was used to analyze data. @*Results@#Seventy-one (71) patients (142 eyes) were included in the study. Mean CSD measurements were as follows: horizontal CSD = 9.76 ± 0.42 mm; vertical CSD = 10.00 ± 0.48 mm; average CSD = 9.88 ± 0.47 mm. There was a significant difference between the means of the vertical and horizontal CSD measurements (P<0.01). There was no significant difference in the mean CSD measurements of the right and left eyes (P= 0.50). @*Conclusions@#In this cohort of adult Filipino patients, the UBM-measured vertical CSD is significantly greater than the horizontal CSD. Establishment of CSD measurements of adult Filipino eyes may be helpful in selecting appropriately-sized intraocular lenses for ciliary sulcus implantation.