Table 1.
Axial length optimization
| Formula | Axial length range | Required changes | Required factors7,12 |
|---|---|---|---|
| Holladay 1with optimized constant | >26.5 mm | 0.829×axial length+4.27 | Adjusted AL, K |
| Haigis with optimized constant | >25 mm | 0.929×axial length+1.56 | Adjusted AL, K, ACD |
| SRK/T with optimized constant | >27 mm | 0.854×axial length+3.72 | Adjusted AL, K |
| Okulix | No axial length adjustment | AL, K, ACD, LT, CCT, WTW, RI, Q | |
| Barret Universal 2 | No axial length adjustment | AL, K, ACD, LT, WTW | |
| Kane | No axial length adjustment | AL, K, ACD, sex, LT, CCT |
Based on modified Wang-Koch method. AL: Axial length, K: Keratometry, ACD: Anterior chamber depth, LT: Lens thickness, CCT: Central corneal thickness, WTW: White to white, RI: Intraocular lens refractive index, Q: Asphericity