Table 3.
Comparison of mean refraction, astigmatism, axis of astigmatism, and keratometric value between premature and term infants
| Ocular parameter* | Premature babies | Term babies | ||
| Right | Left | Right | Left | |
| Refraction (D)† | 1.36 (1.16) | 1.39 (1.22) | 2.4 (2.27) | 2.58 (2.33) |
| median 1.5; 95% CI (1.08 to1.67)** | median 2.9; 95% CI (1.94 to 3.07)** | |||
| Astigmatism (D)‡ (plus cylinder) | 0.32 (0.6) | 0.33 (0.6) | 0.51 (0.55) | 0.54 (0.54) |
| median 0.4; 95% CI (0.19 to 0.46)†† | median 0.5; 95% CI (0.40 to 0.66)†† | |||
| Axis of astigmatism (degrees)§ | 50.3 (50.0) | 64.2 (58.5) | 68.0 (63.8) | 55.6 (55.1) |
| median 67.5; 95% CI (43.90 to 70.65)‡‡ | median 72.5; 95% CI (47.00 to 76.40)‡‡ | |||
| Keratometric reading (D)¶ | 49.46 (1.73) | 49.43 (1.63) | 48.08 (1.56) | 47.96 (1.86) |
| median 49.5; 95% CI (49.00 to 49.90)§§ | median 47.75;95% CI (47.60 to 48.40)§§ | |||
*All values are mean (SD).
5–8 Differences in the medians between the groups.
†p = 0.001 right eye, p = 0.0002 left eye; ‡p = 0.43 right eye, p = 0.27 left eye; §p = 0.4 right eye, p = 0.6 left eye; ¶p = 0.002 right eye, p = 0.001 left eye; **p<0.0001; ††p = 0.73; ‡‡p = 0.73; §§p<0.0001.