Table 1.
Retinal thickness as measured with third-party software on OCT scans from the Cirrus HD and Heidelberg Spectralis systems. Results are reported using means and SDs for the foveal center (top), the central 1-mm line crossing the fovea (middle), and all points of the 6-mm line (bottom). The difference between the instruments is given in μm, and the percentage and the p value are also for comparison of the instruments
| Retinal Thickness | Cirrus HD | Heidelberg Spectralis | Difference | % Difference | p value |
|---|---|---|---|---|---|
| μm | μm | μm | |||
| Foveal center, mean | 225.92 | 228.70 | 2.78 | 1.22 | 0.0555 |
| SD | 17.02 | 18.42 | 8.56 | ||
| 1-mm line, mean | 280.37 | 282.15 | 1.78 | 0.63 | 0.0414 |
| SD | 17.90 | 18.40 | 5.13 | ||
| All points, mean | 301.10 | 302.95 | 1.85 | 0.62 | 0.0052 |
| SD | 39.07 | 38.57 | 7.50 |