Table 5
Biometric errors by the age of 10 years that would be expected from normal ocular growth for pseudophakic eyes operated upon at various ages. It has been assumed that the SRK II formula has been used to determine lens power and the lens was chosen to achieve emmetropia in the immediate postoperative period. For operations performed at an early age the SRK II formula includes an adjustment of the A constant due to the short axial length of eyes of this age as shown
| Age at surgery (weeks) | Expected keratometry change (D) | Expected axial length change (mm) | Constant adjustment for short eyes | Expected IOL error (SRK II) at age 10 | Expected refractive error at age 10 |
|---|---|---|---|---|---|
| 4 | −2 | 5.41 | 3 | 14.72 | −11.78 |
| 12 | 0 | 4.59 | 3 | 14.47 | −11.57 |
| 26 | 0 | 3.71 | 3 | 12.26 | −9.81 |
| 52 | 0 | 2.75 | 2 | 8.88 | −7.11 |
| 104 (2 years) | 0 | 1.63 | 1 | 5.07 | −4.05 |
| 156 (3 years) | 0 | 0.97 | 0 | 2.42 | −1.93 |
| 208 (4 years) | 0 | 0.57 | 0 | 1.44 | −1.15 |
