Table 2.
Clinical Characteristics at Baseline
|
Unilateral Cases |
Bilateral Cases |
|||
|---|---|---|---|---|
| Observation (n = 123) | Surgery (n = 128) | Observation (n = 105) | Surgery (n = 98) | |
| Better-seeing eye [n (%)] | ||||
| Study eye | 5 (4) | 5 (4) | 56 (53) | 58 (59) |
| Fellow eye | 118 (96) | 122 (95) | 46 (44) | 40 (41) |
| Both eyes same visual acuity | 0 | 1 (1) | 3 (3) | 0 |
| Visual acuity* [median (quartiles)] | ||||
| Better-seeing eye | 20/25 (20/40–20/20) | 20/25 (20/32–20/20) | 20/100 (20/200–20/64) | 20/125 (20/200–20/64) |
| Worse-seeing eye | 20/200 (20/400–20/160) | 20/200 (20/400–20/125) | 20/400 (20/640–20/200) | 20/320 (20/640–20/200) |
| Contrast threshold† [median (quartiles)] | ||||
| Better-seeing eye (% contrast required) | 3.2 (4.5–3.2) | 3.2 (4.5–3.2) | 4.5 (6.3–4.5) | 6.3 (6.3–4.5) |
| Worse-seeing eye (% contrast required) | 8.9 (17.8–6.3) | 8.9 (17.8–6.3) | 12.6 (25.1–6.3) | 12.6 (25.1–6.3) |
| Reading speed† [median (quartiles)] | ||||
| Better-seeing eye (words/min) | 109 (86–120) | 105 (84–126) | 72 (43–96) | 69 (39–90) |
| Worse-seeing eye (words/min) | 37 (17–65) | 35 (17–63) | 17 (3–45) | 30 (5–51) |
| Lens status [n (%)] | ||||
| Phakic | 83 (67) | 82 (64) | 52 (50) | 61 (62) |
| Aphakic/pseudophakic | 40 (33) | 46 (36) | 53 (50) | 37 (38) |
*
Snellen equivalent.
†
Unilateral cases, observation group: 1 patient did not have contrast threshold measured, and 2 patients did not have reading speed measured at baseline.