Clinical Study
Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Northern China
Table 1
Patient demographics compared with 5 other published studies.
| | Present |
Guan et al. [12] | Chen et al. [8] | Ferrer-Blasco et al. [7] |
Khan and Muhtaseb [5] | De Bernardo et al. [14] |
| Eyes/patients | 12449/6908 | 1430/827 | 4831/2849 | 4540/2415 | 1230/746 | 757/380 | Age (y) | | | | | | | Mean ± SD | 69.80 ± 11.15 | 72.27 ± 11.59 | 70.56 ± 9.55 | 60.59 ± 9.87 | 75.54 ± 0.71 | 71.89 ± 10.19 | Range | 30, 97 | 16, 98 | 49, 95 | 32, 87 | 30, 104 | 33, 96 | Male/female | 3199/3709 | 359/468 | 1090/1759 | 768/1647 | 343/403 | 176/204 | Corneal astigmatism (D) | | | | | | | Mean ± SD | 1.15 ± 0.84 | 1.07 ± 0.73 | 1.01 ± 0.69 | 0.90 ± 0.93 | 1.03 ± 0.73 | 1.02 ± 0.69 | Range | 0.0, 6.63 | 0.06, 5.52 | 0.05, 6.59 | 0.25, 6.75 | 0.0, 6.2 | 0.06, 4.57 | K1 mean ± SD | 43.93 ± 1.67 | 43.57 ± 1.56 | 43.76 ± 1.53 | 43.48 ± 1.61 | 43.43 ± 1.49 | 43.54 ± 1.43 | K2 mean ± SD | 45.08 ± 1.73 | 44.64 ± 1.65 | 44.76 ± 1.56 | 44.08 ± 1.59 | 44.46 ± 1.56 | 44.56 ± 1.52 | Corneal astigmatism (%) | | | | | | | ≤0.5 D | 20.76 | 21.2* | 23.14 | 58.8 | 24.47 | 23.38 | ≥1.0 D | 47.27 | 45.37 | 41.3 | 34.8 | 40.4 | 41.74 | ≥2.0 D | 13.16 | 10.33 | 8.22 | 9.26** | 9.67 | 8.32 | ≥3.0 D | 3.75 | 2.22 | 3.52 | 5.61*** | 4.61 | 2.64 |
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Not including 0.5 D, not including 2.0 D, and not including 3.0 D. D = diopter, K1 = flat keratometry, and K2 = steep keratometry.
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