Table 1.
Performance data for each chart
| Single letter scoring | ||||
| Mean difference (95% CI) logMAR | Min/max difference logMAR | TRV (95% CLA) logMAR | Line scoring TRV (95% CLA) logMAR | |
| ETDRS-ETDRS | 0.00 (0.02) | −0.16, 0.17 | ±0.14 (7 ETDRS letters) | ±0.20 (2 ETDRS lines) |
| cRLM-cRLM | 0.00 (0.02) | −0.22, 0.23 | ±0.17 (5 cRLM letters) | ±0.20 (2 cRLM lines) |
| Snellen-Snellen | 0.03 (−0.01, 0.06) | −0.36, 0.16 | ±0.29 (variable number of Snellen letters) | ±0.30 (variable number of Snellen lines) |
| ETDRS-cRLM | 0.01 (−0.01, 0.03) | −0.13, 0.20 | - | - |
| ETDRS-Snellen | 0.02 (−0.02, 0.06) | −0.26, 0.27 | - | - |