Table 3.
Repeatability of Diagnostic Parameters
| N | PPG | PG | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Diagnostic Parameters |
ICC | SD | CV | ICC | SD | CV | ICC | SD | CV |
| RTVue FD-OCT | |||||||||
| GCC-AVG (µm) | 0.98 | 1.03 | 1.09 | 0.99 | 1.06 | 1.23 | 0.99 | 0.98 | 1.25 |
| GCC-FLV (%) | 0.91 | 0.38 | 0.96 | 0.59 | 0.95 | 1.01 | |||
| GCC-GLV (%) | 0.98 | 0.68 | 0.99 | 0.90 | 0.99 | 1.01 | |||
| GCC-PCV | 0.85 | 0.01 | 0.92 | 0.01 | 0.93 | 0.01 | |||
| GCC-SID (µm) | 0.94 | 1.12 | 0.95 | 1.24 | 0.97 | 1.61 | |||
| MR-AVG (µm) | 0.99 | 1.20 | 0.52 | 0.99 | 1.06 | 0.49 | 0.99 | 1.36 | 0.65 |
| Stratus TD-OCT | |||||||||
| NFL-AVG (µm) | 0.96 | 1.71 | 1.72 | 0.99 | 1.52 | 1.75 | 0.98 | 2.22 | 2.86 |
| MR-AVG (µm) | 0.97 | 2.17 | 0.91 | 0.93 | 3.69 | 1.61 | 0.96 | 3.01 | 1.36 |
Abbreviations: N = normal; PPG = pre-perimetric glaucoma; PG = perimetric glaucoma; ICC = intraclass correlation; SD: Pooled standard deviation; CV = coefficient of variation. GCC = ganglion cell complex thickness; AVG = average; FLV (%) = focal loss volume expressed as a percentage of the average GCC volume in the normal group; GLV = global loss volume; PCV = pattern coefficient of variation; SID = superior - inferior difference; MR = macular retina thickness; NFL = nerve fiber layer thickness. FD-OCT: Fourier-domain optical coherence tomography; TD-OCT: time-domain optical coherence tomography