Comparison of Measurement of Anterior Segment Parameters Between Scheimpflug Camera and Ultrasound Biomicroscopy

PURPOSE: To evaluate the clinical reliability of Pentacam(R) by comparing anterior chamber parameters measured by Oculus Pentacam system (Oculus Inc., Germany) and Hi-scan ultrasound biomicroscopy (OPTIKON 2000, Rome, Italy) in primary angle closure (PAC) and normal patients. METHODS: A prospective study was performed from June 2006 to January 2007. Fifty-one eyes in 26 primary angle-closure patients and 39 eyes in 20 normal control patients, for a total of 90 eyes of 46 patients were recruited from glaucoma out-patient clinics. The correlation and agreement of both measurements of anterior chamber depth and anterior chamber angle measured by UBM and Pentacam(R) were calculated. Sensitivity and specificity of each tool were also compared and the diagnostic value of angle closure was examined. RESULTS: Anterior chamber depth measured by UBM and Pentacam(R) showed strong correlation in the normal control group (r=0.821) and PAC group (r=0.957). Anterior chamber angle showed moderate correlation in the normal control group (r=0.523) and PAC group (r=0.456) while good agreement was also observed. In diagnosing angle closure, anterior chamber measurements appear similar in UBM and Pentacam(R) using the ROC curve (AUC of UBM, 0.942; AUC of Pentacam(R), 0.931). CONCLUSIONS: Pentacam(R) shows high to moderate correlation of anterior chamber measurements and good agreement compared with UBM. Pentacam(R) shows similar ability in diagnosing angle closure compared with UBM and thus is expected to be a good tool in diagnosing angle closure.

Clinical Study on Glaucomatous Patients

We analysed clinically 354 glaucomatous patients from 1983 to 1987 who visited the clinic of the Department of Ophthalmology of National Medical Center. The results were as follows: 1) The prevalence of glaucoma was 1.56% among the out-patients. 2) The primary open-angle glaucoma(POAG) was the most frequent type. 3) The mean age of the patients with POAG was 47.8 +/- 14.2 years and 60.8 +/- 8.9 years was that of the patients with primary angle-closure glaucoma(PACG). 4) There was no sexual preference in various types of glacoma, except PACG and secondary glaucoma. 5) There was no significant difference in laterality between right and left eyes.

Clinical study of Korean glaucomatous patients

In order to determine the distribution of each type of glaucoma in Korea, a retrospective clinical study was carried out on 206 glaucomatoils patients (295 eyes) who were followed from July 1982 to December 1985 in theClaucoma Clinic of the Department of Ophthalmology of Hanyang University Hospital. The distribution of glaucomatous patients was as follows; 34.0% primary open-angle glaucoma (POAG),32.5% secondary glaucoma,20.9% primary angle-closure glaucoma (PACG),7.3% ocular hypertension,3.9% congenital glaucoma, and 1.5% low tension glaucoma. In serondary glaucoma, glaucoma associated with uveitis occurred most frequently, and aphakic glaucoma, neovascular glaucoma, steroid-induced glaucoma, pigmentary glaucoma and exfoliative glauroma followed. The acute stage of PACG presented the highest initial IOP, 55.2+/-8.4mmHg, where as the initial IOP of POAG patients was 33.4+/-15.5 mmHg. Sixty-two per percent of POAG and 98% of PACG patients were over 40 years of age, and the mean age of the POAG and PACG patients was 43.1+/-16.3 and 61.6+/-9.5 years, respectively. There was no remarkable sex-difference associated with glaucoma, in PACG which showed an incidence of 79.1% in females. There was no significant difference in laterality between the right and left eyes with either glaucoma or ocular hypertension. Bilateral involvement of POAG and PACG during the follow-up period was 7l.4% and 32.6%, respectively.