Baseline characteristics of the groups
| Parameter | OVD1 (N=50 eyes) | OVD2 (N=50 eyes) | P value |
| Age (years) | |||
| Mean (SD) | 74.0 (±6.6) | 75.2 (±8.3) | 0.45* |
| Range | 61–89 | 45–88 | |
| AXL (mm) | |||
| Mean (SD) | 23.6 (±1.6) | 23.9 (±1.5) | 0.74* |
| Range | 22.5–25.8 | 22.4–25.3 | |
| ACD (mm) | |||
| Mean (SD) | 3.1 (±0.4) | 3.0 (±1.3) | 0.67* |
| Range | 2.1–4.0 | 2.4–3.6 | |
| Km (D) | |||
| Mean (SD) | 44.0 (±1.3) | 43.4 (±1.5) | 0.07* |
| Range | 42.1–46.0 | 41.2–45.5 | |
| IOP (mm Hg) | |||
| Mean (SD) | 15.5 (±1.7) | 15.7 (±2.0) | 0.78* |
| Range | 12–22 | 12–23 | |
| ECC (cell/mm2) | |||
| Mean (SD) | 2234.1 (±497.8) | 2275.0 (±401.7) | 0.69* |
| Range | 1287–3396 | 1286–3207 | |
| CCT (microns) | |||
| Mean (SD) | 540.9 (±34.9) | 553.7 (±29.9) | 0.45* |
| Range | 464–602 | 487–594 | |
| CDVA (logMAR) | |||
| Mean (SD) | 0.5 (±0.1) | 0.6 (±0.1) | 0.14* |
| Range | 0.9–0.4 | 0.9–0.4 |
*P value calculated with ANOVA.
ACD, anterior chamber depth;ANOVA, analysis of variance; AXL, axial length;CCT, central corneal thickness; CDVA, corrected distance visual acuity; D, diopters; ECC, endothelial cells count; IOP, intraocular pressure; Km, mean corneal power;OVD, ophthalmic viscoelastic device; logMAR, logarithm of minimum angle of resolution.