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Holladay 1 Formula ~ "Double K" Correction Method.

Each of the two tables listed below assume an average pre-refractive surgery corneal power of 43 D and implantation of an Alcon SA60AT intraocular lens.


After MYOPIC Keratorefractive Surgery
IOL Power Adjustment Table for Holladay 1 Formula

ADD TO: Based on the Aramberri "Double K" method, the numbers in each row of the MYOPIC refractive correction represent the amount in diopters that must be added to the calculated IOL power when using the Holladay 1 Formula.

MYOPIC Axial Length (mm)  
Refractive
Correction
(D)
20 22 24 26 28 30  
2 0.5 0.5 0.5 0.4 0.3 0.1 
3 0.7 0.7 0.7 0.7 0.4 0.2 
4 0.9 1.0 1.0 0.9 0.6 0.4 
5 1.2 1.2 1.3 1.2 0.8 0.5 
6 1.4 1.5 1.6 1.5 1.0 0.7 
7 1.6 1.7 1.8 1.7 1.2 0.9  
8 1.9 2.0 2.1 2.0 1.5 1.0 
9 2.1 2.2 2.4 2.3 1.7 1.2 
10 2.4 2.5 2.7 2.6 1.9 1.4 

After HYPEROPIC Keratorefractive Surgery
IOL Power Adjustment Table for Holladay 1 Formula

SUBTRACT FROM: Based on the Aramberri "Double K" method, the numbers in each row of the HYPEROPIC refractive correction represent the amount in diopters that must be subtracted from the calculated IOL power when using the Holladay 1 Formula. If no number appears, it means that the formula is not applicable for that combination of axial length and refractive correction.

HYPEROPIC Axial Length (mm)  
Refractive
Correction
(D)
20 22 24 26 28 30  
2 0.4 0.4 0.5 0.4 0.2 0.0 
3 0.6 0.7 0.7 0.5 0.2 -- 
4 0.9 0.9 0.9 0.6 0.4 -- 
5 1.1 1.0 1.0 0.7 -- -- 
6 1.1 1.1 1.1 0.7 ----  

The above two tables were adopted from the following:

Aramberri J. Intraocular lens power calculation after corneal refractive surgery: Double K method. J Cataract Refract Surg 2003; 29(11): 2063-2068.

Koch, D., Wang I. Calculating IOL power in eyes that have had refractive surgery. J Cataract Refract Surg 2003 29(11) 2039-2042.

 


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"Double K" Formula Corrections

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5620 East Broadway Road
Mesa, Arizona 85206

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