Optic nerve optical coherence tomography analysis showing retinal nerve fiber layer (RNFL) thickness measured in micrometres
| RNFL thickness | Control group (n=61) | COVID-19+ (n=28) | P value | Mean difference | 95% CI | |||
| Mean | SD | Mean | SD | Inferior | Superior | |||
| RNFL G | 101.6 | 9.3 | 109.3 | 9.8 | 0.001** | 7.7 | 3.4 | 12.1 |
| RNFL T | 73.9 | 12.0 | 77.8 | 14.8 | 0.228 | 3.9 | −2.5 | 10.3 |
| RNFL TS | 142.3 | 18.7 | 153.3 | 15.6 | 0.005** | 11.0 | 3.3 | 18.6 |
| RNFL TI | 141.7 | 21.8 | 157.3 | 18.9 | 0.001** | 15.6 | 6.5 | 24.7 |
| RNFL N | 73.7 | 12.9 | 83.5 | 15.9 | 0.006** | 9.8 | 2.9 | 16.7 |
| RNFL NS | 112.8 | 24.1 | 114.3 | 22.3 | 0.788 | 1.4 | −9.1 | 11.9 |
| RNFL NI | 121.0 | 28.7 | 126.6 | 24.2 | 0.339 | 5.6 | −6.1 | 17.4 |
** indicates p<0.01.
G, global; N, nasal; NI, nasal inferior; NS, nasal superior; RNFL, retinal nerve fibre layer; T, temporal; TI, temporal inferior; TS, temporal superior.