BESST II IOL POWER CALCULATOR                                    

 
 
How accurate is BESSt 2.0 Formula?
The following graphs summarise the greater accuracy of the new algorithm compared to the previous one and compared to some of the most accurate formulas currently available. 

In summary:
BESSt 2.0 is more accurate than BESSt 1.0 in hyperopic treated eyes
BESSt 2.0 is more accurate than Haigis-L in myopic treated eyes 
The SDs of the mean and mean absolute errors of BESSt 2.0 were consistently smaller than those using the Holladay Estimated K (EstK) algorithm provided by the Pentacam and using a double-K approach. 
MEAN ERROR +/- SD [D]:







MEAN ERROR +/- SD [D]:
Myopic-lasered eyes:
BESSt 2.0 v BESSt 1.0
(-0.02 ±0.81) v (-0.21 ±0.78); p= 0.32

BESSt 2.0 v Haigis-L (IOL Master)
(-0.02 ±0.81) v (-0.63 ±1.02); p= 0.007

BESSt 2.0 v PentacamHolladayEstK (dk)
(-0.02 ±0.81) v (+0.12 ±1.14); p= 0.57

Hyperopic-lasered eyes:
BESSt 2.0 v BESSt1.0
(+0.02 ±1.00) v (-1.10 ±0.90); p= 0.0002

BESSt 2.0 v PentacamHolladayEstK (dk)
(+0.02 ±1.00) v (+0.01 ±1.00); p= 0.95

Overall:
BESSt 2.0 v BESSt1.0
(-0.002 ±0.89) v (+0.38 ±0.95); p= 0.05

BESSt 2.0 v PentacamHolladayEstK (dk)
(-0.002 ±0.89) v (+0.15 ±1.12); p= 0.41


MEAN ABSOLUTE ERROR’S SD [D]:







MEAN ABSOLUTE ERROR’S SD [D]:
Myopic-lasered eyes:
BESSt 2.0 v BESSt 1.0
(±0.45) v (±0.45)

BESSt 2.0 v Haigis-L (IOL Master)
(±0.45) v (±0.69)

BESSt 2.0 v PentacamHolladayEstK (dk)
(±0.45) v (±0.66)

Hyperopic-lasered eyes:
BESSt 2.0 v BESSt 1.0
(±0.61) v (±0.69)

BESSt 2.0 v PentacamHolladayEstK (dk)
(±0.61) v (±0.73)

Overall:
BESSt 2.0 v BESSt 1.0 
(±0.52) v (±0.63)

BESSt 2.0 v PentacamHolladayEstK (dk)
(±0.52) v (±0.73)

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