Comparison of corneal measurements in keratoconic eyes using rotating Scheimpflug camera and scanning-slit topography

International Journal of Ophthalmology

卷:8

Mohammad Amin Kamaleddin¹  Morteza Naderan²  Mohammad Taher Rajabi²  Saeed Shoar²  Mohammad Naderan² 

[1] Department of Biotechnology, College of Science, University of Tehran, Tehran 1347615323, Iran;

[2] Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran 1336616351, Iran;

关键词: keratoconus;    Orbscan;    Pentacam;    rotating scheimpflug camera;    scanning-slit topography;    corneal pachymetry;    central corneal thickness;    thinnest corneal thickness;    anterior chamber depth;    pupil diameter;   

DOI  :  10.3980/j.issn.2222-3959.2015.02.11

来源: DOAJ

【 摘 要 】

AIM: To compare the anterior segment measurements obtained by rotating Scheimpflug camera (Pentacam) and Scanning-slit topography (Orbscan IIz) in keratoconic eyes.METHODS: A total of 121 patients, 71 males (58.7%) and 50 females (41.3%) (214 eyes) with the diagnosis of keratoconus (KC) were enrolled in this study. Following diagnosis of KC by slit-lamp biomicroscopic examination, central corneal thickness (CCT), thinnest corneal thickness (TCT), anterior chamber depth (ACD), and pupil diameter (PD) were measured by a single examiner using successive instrumentation by Pentacam and Orbscan.RESULTS: There was no significant difference between the two instruments for the measurement of CCT and TCT. In contrast, scanning-slit topography measured ACD (3.46±0.40 mm vs. 3.38±0.33 mm, P=0.019) and PD (4.97±1.26 mm vs 4.08±1.19 mm, P<0.001) significantly larger than rotating Scheimpflug camera. The two devices made similar measurements for CCT (95% CI: -2.94 to 5.06, P=0.602). However, the mean difference for TCT was -6.28 (95% CI: -10.51 to -2.06, P=0.004) showing a thinner measurement by Orbscan than by Pentacam. In terms of the ACD, the mean difference was 0.08 mm (95% CI: 0.04 to 0.12, P<0.001) with Orbscan giving a slightly larger value than Pentacam. Similarly, Orbscan measurement for PD was longer than Pentacam (95% CI: 0.68 to 1.08, P<0.001).CONCLUSION: A good agreement was found between Pentacam and Orbscan concerning CCT measurement while comparing scanning-slit topography and rotating Scheimpflug camera there was an underestimation for TCT and overestimation for ACD and PD.

【 授权许可】

Unknown