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Afsun Sahin, Zuhat Usalp, Nilgun Yildirim, Özge Bolluk, Ahmet Özer; Which Scheimpflug parameters are most predictive in detecting narrow anterior chamber angles?. Invest. Ophthalmol. Vis. Sci. 2013;54(15):3483. doi: https://doi.org/.
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© ARVO (1962-2015); The Authors (2016-present)
To find out which Scheimpflug parameters are most useful in detecting narrow anterior chamber angles in Turkish subjects.
The study was conducted at the Eskisehir Osmangazi University Medical School Department of Ophthalmology. One hundred of fifty five patients who admitted to our clinic due to refraction errors were included in the study. All patients underwent ophthalmological examination including limbal anterior chamber depth (van Herick), ultrasonic pachymetry, gonioscopy, and Pentacam HR® (Oculus, Wetzlar, Germany) measurements.
Three hundred and ten eyes of 155 patients were included in the study. Ninety eight patients (% 63,2) were females, 57 (% 36,8) were males. The mean age was 54,3 ±9,5 (40-80) years. The mean central corneal thickness was 537,59±32,23 µm (441-643 µm) for females and 536,73±32,71 µm (441-643 µm) for males (p>0.05). Mean anterior chamber depth (ACD) assessed by Pentacam was 2,55±0,38mm in females and 2,69±0,34mm in males. The difference was statistically significant (p<0,01). The mean ACD of females and males were 2,55±0,38 mm and 2,69±0,34 mm (1,38-3,38 mm), respectively (p<0,01). Mean anterior chamber angle (ACA) assessed by Pentacam was 31,69°±6,22 in females and 33,07°±5,60 mm in males. The difference was not statistically significant (p>0.05). The mean ACA of all cases was 32,20°±6,02 (13,10-46,70). Mean anterior chamber volume (ACV) assessed by Pentacam was 124,59±32,13 mm3 in females and 140,75±31,64 mm3 in males (p<0,001). Fifteen out of 310 eyes were Schaffer grade 2, 224 were grade 3, 71 were grade 4. The percentage of narrow angle eyes was %4,8 (15/310). Considering gonioscopy as the gold standard, the sensitivity and specificity of ACD values obtained by Pentacam detecting narrow angles were 75% and %99, respectively. For anterior chamber volume the sensitivity was 87% and specificity was 91%. For ACA sensitivity was 87% and specificity was 96%.
ACA, ACV and ACD values obtained by Pentacam seem reliable parameters detecting narrow angled subjects. Since Pentacam HR device is a non-contact, easy-to-use, short measuring time method, it can be valuable in the diagnosis, treatment of glaucoma patients.
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