Biometry

RCOphth Recommendations (2010)

<22mm: HofferQ
22-24.5mm: SRK/T, Holladay, Hoffer Q
24.6-26mm: Holladay
>26mm: SRK/T

Repeat Biometry if:

AL <21.2 or >26.6
Kmean <41 or >47
Delta K >2.5
Difference in average K between 2 eyes >0.9
Difference in AL between 2 eyes >0.7

A useful website to access regarding post-refractive laser calculations for biometry is www.ASCRS.org http://iolcalc.ascrs.org/

Surgically Induced Astigmatism Calculator: http://www.sia-calculator.com/
ULIB Optimised A-constants for IOL Master: http://www.augenklinik.uni-wuerzburg.de/ulib/c1.htm