Table 2.
Comparison of different studies assessing visual outcomes in patients with PRK enhancement after primary PRK surgery
| Study | Year | No. eyes | Follow-up (months) | UDVA 20/20 or bettera | UDVA 20/40 or bettera | CDVA loss of ≥ 1 linea | MRSE within ± 0.50 D of intendeda | MRSE within ± 1.00 D of intendeda |
|---|---|---|---|---|---|---|---|---|
| Snibson [11] | 1996 | 58 | 3 | – | 27 | – | – | – |
| 6 | – | 22 | – | – | – | |||
| 12 | – | 64 | – | – | 69 | |||
| Pop [12] | 1996 | 90 | 6 | – | 93 | 9 | – | – |
| 12 | – | 84 | – | – | 50 | |||
| Hefetz [9] | 1997 | 66 | 12 | – | 58.8b (moderate myopes) | – | – | 88.2 (moderate myopes) |
| Rozsíval [10] | 1998 | 48 | 6 | 26.1 | 82.6 | 23.6 | 45.8 | 75.0 |
| Xia [19] | 1999 | 51 | 12 | 39.1 | – | – | – | 86.3 |
| Pietilä [8] | 2002 | 63 | 12 | 38 | 86 | – | 64 | 86 (low residual myopia) |
| Broderick [18] | 2016 | 78 | 3 | 71.1 | – | – | 76.9 | - |
| 6 | 73.0 | – | – | 76.7 | – | |||
| Current study | 2020 | 188 | 3 | 85 | 99 | 7 | 88 | 98 |
| 12 | 75 | 99 | 9 | 86 | 98 |
UDVA uncorrected distance visual acuity, CDVA corrected distance visual acuity, MRSE mean refractive spherical equivalent
aValues reported as percentage of eyes
bUDVA 20/25 or better