Measurements of anterior segment parameters using three different non-contact optical devices in keratoconus patients

Abstract

AIM: To evaluate them easurem ents of anterior segm ent param eters using three different non-contact optical devices in keratoconus patients. METHODS: A hundred and one eyes of 55 keratoconus patients were enrolled in this study. Them eanage was 26.2±8.9 years. The inclusion criteria were keratoconus stage I to III according to the Amsler-Krumeich keratoconus classification. All them easurem ents were done by the same operator, under the mesopic light condition and repeated with three different optical methods; Visante, Orbscan and Pentacam. The evaluated anterior segment parameters were anterior cham ber depth (ACD), central and thinnest corneal thickness (CCT and TCT) and pupil diameter (PD). RESULTS: The mean CCT measured by Visante, Orbscan and Pentacam were as follows: 462.0±48.1 µm, 463.9±60.9µm, 47 6.5 ±45.3µm, respectively (P=0.87 3). The mean ACD values were 3.34±0.33 mm, 3.26±0.3 3mm, 3.49±0.40mm, respectively (P=0.118). The mean PD measurem ents were 5.11 ±1.1 4mm, 4.80±0.85mm, 3.80±1.38mm, respectively (P<0.001). The mean TCT measurements of Visante, Orbscan and Pentacam were 43 7.9±48.2µm, 447.6±60.6µm and 45 9.9±44.0µm, respectively (P=0.21 4). The Visante and Orbscan m easured CCT similarly, while Pentacam measured CCT thicker than the other two. The Visante measured TCT thinner than the other two devices. In ACD measurements, Orbscan was the one giving the lowest values. PD was measured differently by the devices. CONCLUSION: Although TCT, CCT and ACD measurements acquired by Visante, Orbscan and Pentacam in keratoconus patientsare similar, PD measurem ents show large differences am ong the devices. © Copyright International Journal of Ophthalmology Press.