Testability rates with different optotypes
| Study | 0ptotype | n | Testability | ||
| 3 yo | total | 3 yo | total | ||
| 4 yo | 4 yo | ||||
| Present study | Single-crowded tumbling E | 929 | 1735 | 91.90% | 94.9% |
| 806 | 98.30% | ||||
| Leone et al24 | HOTV-ATS | 363 | 723 | 86.5% | 91.4% |
| 360 | 96.3% | ||||
| Pan et al3 | HOTV-ATS | 460 | 1027 | 81% | 90.5% |
| 567 | 98% | ||||
| Kvarnstrom et al27 | HOTV chart | 478 | 707 | 84.80% | 87.4% |
| 229 | 92.80% | ||||
| Kvarnstrom et al27 | LEA chart | 478 | 707 | 82.80% | 86.1% |
| 229 | 92.90% | ||||
| Kupl et al23 | HOTV-ATS | 225 | 858 | (3–3.5 yo not included) | 97.6% (5yo included) |
| 633 | 96.70% | ||||
| Becker et al12 Paediatric routine examination | Single LEA symbols | 71 | 134 | 76.00% | 85.00% |
| 63 | 95.00% | ||||
| Becker et al12 Ophthalmic revaluation | Single LEA symbols | 10 | 28 | 80.00% | 92.80% |
| 18 | 100.00% | ||||
For a more accurate comparison, testability rates are presented separately at 3 and 4 yo.
yo, years old.