Table 3.
comparison of the previous studies for other OCT devices
| Current study | Kim et al. [4] | Zhang et al. [6] | Wu et al. [5] | |
|---|---|---|---|---|
| OCT device tested | Spectralis | Cirrus | RTVue | Stratus |
| Acquisition technology | Spectral domain | Spectral domain | Fourier domain | Time domain |
| Scan speed (A-scans per second) | 40,000 | 27,000 | 26,000 | 768 |
| Axial resolution (μm) | 7 | 5 | 5 | 10 |
| Transverse resolution (μm) | 14 | 20 | 15 | 20 |
| Quality score scale | (Q, 0-40) | (SS, 0-10) | (SSI, 0-100) | (SS, 0-10) |
| Minimal suggested quality by manufacturer | 15 | 6 | 30 | 6 |
| Quality score & thickness relationship | Thickness decreases with higher SS (RNFL & macula) | Thickness increases with higher SS (RNFL) | Thickness increases with higher SS (RNFL) | Thickness increases with higher SS (RNFL) |
| Outer retina segmentation border | outer reflective band | outer reflective band | second inner hyperreflective band | inner hyperreflective band |
OCT Optical Coherence Tomography, RNFL Retinal Nerve Fiber Layer, SS Signal strength, SSI Signal Strength Index