Abstract
Purpose: To compare corneal measurements including elevation, curvature and thickness values obtained using two imaging systems, a Scheimpflug camera (Pentacam) and an optical coherence tomography device (Visante OMNI) in keratoconic subjects.
Methods: Corneal measurements from 35 eyes (22 subjects) were obtained using both devices and compared. Agreement was determined using the Bland- Altman analysis 95% limits of agreement (LoA).
Results: The Pentacam measured significantly greater simulated keratometry readings in the flattest meridian (K1) (45.29 ± 3.48 diopters (D) versus 44.92 ± 2.97 D, p = 0.04) and in the steepest meridian (K2) (48.29 ± 3.83D versus 47.88 ± 3.49 D, p = 0.01). The Bland Altman 95% LoA between the devices were from −1.59 to 2.33 D for K1 and from −1.35 to 2.17 D for K2. Pentacam anterior corneal elevations were significantly higher (p = 0.03) as were posterior corneal elevations (p < 0.0001). The 95% LoA were from −15.59 to 24.51 μ and from −22.92 to 48.78 μ for anterior and posterior corneal elevations respectively.
Compared to Visante OMNI, Pentacam recorded greater central corneal thickness (CCT) and minimum corneal pachymetry (MCP) values by 19.41 ± 18.25 μ and 13.03 ± 12.22 μ respectively (both p < 0.0001). The 95% LoA were from −16.37 to 55.19 μ for CCT and from −10.92 to 36.98 μ for MCP values.
Conclusions: The Pentacam measured significantly greater corneal curvature, elevation and thickness values compared to Visante OMNI. In clinical practice, these devices are not interchangeable for corneal measurements in keratoconic subjects.
| Original language | English |
|---|---|
| Article number | 1307 |
| Pages (from-to) | 35 |
| Number of pages | 1 |
| Journal | Clinical and Experimental Ophthalmology |
| Volume | 41 |
| Issue number | Suppl. 1 |
| Publication status | Published - Nov 2013 |
| Event | Annual Scientific Congress of Royal Australian and New Zealand College of Ophthalmologists (45th : 2013) - Hobart Duration: 2 Nov 2013 → 6 Nov 2013 |