Table 2.
Corneal hysteresis (CH) and corneal resistance factor (CRF) before and three months after surgery
| Mean ± Standard Deviation | ||||
|---|---|---|---|---|
| Trabeculectomy | PT | AGV | PE | |
| Pre-operative CH (mmHg) | 5.4±1.8 | 5.3±1.7 | 5.2 ±2.6 | 8.1±1.8 |
| Post-operative CH ( mmHg) | 7.5±1.1 | 7.6±0.9 | 7.5±1.7 | 8.1±1.6 |
| P (within group) | <0.001 | <0.001 | <0.001 | 0.704 |
| Pre-operative CRF | 7.7±1.9 | 8.5 ± 0.8 | 8.7±1.7 | 8.7±1.2 |
| Post-operative CRF | 9±1.6 | 8.9±0.9 | 9.3±2 | 9.1±1.3 |
| P (within group) | <0.001 | <0.001 | <0.001 | <0.001 |
PT, Phacotrabeculectomy; AGV, Ahmed glaucoma valve implantation; PE, phacoemulsification; CH, corneal hysteresis; CRF, corneal resistance factor