Predicting the refractive outcome after cataract surgery:: the comparison of different IOLs and SRK-II v SRK-T

Aim: To determine any differences between the predictive abilites of the IOL calculation formulas of SRK-II and SRK-T and to compare these using two different IOL types. Methods: A prospective, consecutive, single surgeon clinial was conducted on 400 consecutive patients who received routine, standardised phacoemulsification cataract surgery. 200 had cataract surgery and had the Alcon MZ30BD, a 5.5 mm one piece PMMA IOL, and another used the Chiron C11UB, a silicone plate haptic IOL. The data used optimised A-constants, The measures were preoperative axial length and keratometry, IOL implanted and refractive error at,4-6 weeks postoperatively. Results: There-was no significant difference between the predictive abilities of SRK-II or SRK-T. For the Alcon and Chiron lens respectively, prediction errors using SRK-II were <0.5 dioptres in 58% and 70% and for <1.0 dioptres in 84% and 92%. These differences were statistically significant (chi(2), p=0.02). Conclusion-There-are differences in the predictability of refractive outcomes between intraocular lens styles.