Information on angle alpha allows more accurate IOL predictions

Centration of implants — particularly multifocals, extended depth-of-focus lenses or moderate to high toric models — is critical to achieve maximum optical performance. Therefore, when implanting these types of IOLs, proper centration is vital to good visual outcomes. A myriad of issues may result from decentered implants, including glare, halos and a decline of visual acuity. Toric lenses, if not aligned properly, may also result in residual astigmatism and reduced visual quality. The best way to center these IOLs remains, however, a topic of debate.
The terms angle kappa and

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