Table 1.
Demography, mean visual acuity and refraction for keratoconus group, keratoconus subjects with visual acuity of 0.00 LogMar and for control group.
| Keratoconus group | Control group | Keratoconus with VA 0.00 LogMar | pmann whitney Keratoconus versus controls | pmann whitney Keratoconus with 0.00 LogMar versus controls | |
|---|---|---|---|---|---|
| N (eyes) | 22 (38) | 35 (35) | 14 (20) | – | – |
| Age range (years) | 17–38 | 20–32 | 17–38 | – | – |
| Mean age (years) | 25.6 ± 5.0 | 25.0 ± 2.6 | 25.2 ± 5.7 | U = 363.5, p = 0.72 | u = 177.5, p = 0.70 |
| Gender (male:female) | 14:8 | 17:18 | 9:5 | x22,36 = 1.24, p = 0.29† | x22,36 = 1.00, p = 0.36† |
| VA range (LogMar) | 0.00 to 0.50 | 0.00 to 0.00 | 0.00 to 0.00 | – | – |
| VA (LogMar) | 0.08 ± 0.12 | 0.00 ± 0.00 | 0.00 ± 0.00 | u = 350.0, p < 0.001** | – |
| Sphere (D) | − 2.41 ± 2.95 | − 0.68 ± 1.80 | − 1.29 ± 2.39 | u = 941.0, p = 0.002 | u = 445.0, p = 0.10 |
| Cylinder (D) | − 2.11 ± 1.90 | − 0.59 ± 0.43 | − 1.66 ± 1.33 | u = 1174.0, p < 0.001** | u = 580.0, p < 0.001** |
*Significant level of < 0.05, **Significant level of < 0.005. †Fisher’s exact test was done to test the gender differences between groups.
VA, visual acuity; D, diopter.