Table 4. Factors related to absolute value of prediction error after cataract surgery in patients with prior refractive laser surgery. All subjects were divided into two groups: those having prediction error of 0.5 D or less (Group A) or prediction error more than 0.5 D (group B). Prediction error was calculated by using the Barrett True-K formula.
| Variables | Group A (AE ≤0.5 D) | Group B (AE >0.5 D) | P value |
|---|---|---|---|
| Number | 108 | 23 | |
| Postoperative values | |||
| Visual acuity (LogMAR) | |||
| UDVA | 0.061±0.10 | 0.19±0.22 | 0.001† |
| UNVA | 0.090±0.11 | 0.10±0.12 | 0.65† |
| Manifest refraction (D) | |||
| Spherical equivalent | −0.16±0.36 | −0.58±0.85 | 0.016† |
| Refractive sphere | −0.005±0.38 | −0.40±0.87 | 0.028† |
| Refractive astigmatism | −0.31±0.38 | −0.35±0.32 | 0.37† |
| Target refraction (D) | |||
| Barrett true-K | −0.069±0.25 | −0.36±1.05 | <0.001† |
| Preoperative values | |||
| Age | 50.1±5.8 | 50.0±5.8 | 0.70† |
| Female (%) | 40 (67.8) | 15 (60.0) | 0.92‡ |
| Keratometry (D) | 40.96±2.27 | 39.13±2.30 | 0.002† |
| Central corneal thickness (μm) | 489.6±37.1 | 481.4±54.8 | 0.84† |
| Anterior chamber depth (mm) | 3.43±0.32 | 3.34±0.23 | 0.36† |
| Axial length (mm) | 25.46±1.66 | 26.59±1.97 | 0.010† |
| IOL power (D) | 20.3±3.4 | 20.3±5.1 | 0.23‡ |
†, P value by Man-Whitney test; ‡, P value by chi-squared test. AE, absolute value of prediction error; UDVA, uncorrected distance visual acuity; UNVA, uncorrected near visual acuity; IOL, intraocular lens.