Comparison of full-field ERG parameters before and after the operation
| Non-CD group | CD group | |||||
| Preoperatively | Postoperatively | P value | Preoperatively | Postoperatively | P value | |
| Amplitude, mean (95% CI), µV | ||||||
| a-wave | −4.4 (−5.0 to −3.8) | −4.9 (−5.4 to −4.3) | 0.090 | −4.9 (−6.0 to −3.8) | −3.1 (−4.2 to −2.0) | 0.001* |
| b-wave | 20.2 (18.1 to 22.3) | 21.1 (18.7 to 23.4) | 0.307 | 19.1 (14.5 to 23.8) | 13.3 (9.3 to 17.3) | 0.001* |
| PhNR | 17.3 (15.6 to 19.1) | 18.7 (16.7 to 20.6) | 0.008* | 17.0 (12.4 to 21.5) | 11.4 (7.7 to 15.0) | 0.002* |
| PhNR/b-wave amplitude ratio, mean (95% CI) | 0.86 (0.84 to 0.89) | 0.90 (0.87 to 0.93) | 0.002* | 0.88 (0.83 to 0.93) | 0.85 (0.79 to 0.91) | 0.219 |
| Implicit time, mean (95% CI), ms | ||||||
| a-wave | 14.8 (14.4 to 15.2) | 14.3 (14.0 to 14.7) | 0.027* | 15.3 (13.5 to 17.0) | 15.0 (13.6 to 16.4) | 0.811 |
| b-wave | 32.2 (31.5 to 32.9) | 31.4 (30.9 to 32.0) | 0.004* | 33.0 (31.0 to 35.0) | 33.7 (31.4 to 36.0) | 0.300 |
| PhNR | 75.3 (72.6 to 78.0) | 72.3 (70.4 to 74.3) | 0.039* | 75.2 (71.2 to 79.2) | 79.2 (73.2 to 85.2) | 0.120 |
The preoperative and postoperative full-field ERG parameters were compared using paired t-tests in both groups.
*P value <0.05 was considered significant
CD, choroidal detachment; ERG, electroretinographic; PhNR, photopic negative response.