SRK-T SRK/T Formula IOL Intraocular Lens Power Calculations Prior Keratorefractive Surgery RK LASIK LASEK PRK SRK/T Formula IOL Intraocular Lens Power Calculations SRK-T Prior Keratorefractive Surgery RK LASIK LASEK PRK Eye Cataract Surgery Eyes 2008-09-13
SRK/T formula MYOPIC keratorefractive surgery IOL power adjustment table based on the Aramberri "double K method." The numbers in each row of refractive correction represent the amount in diopters that must be ADDED TO the calculated IOL power when using the SRK/T formula.
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.
MYOPIC
Axial Length (mm)
Refractive Correction (D)
20
22
24
26
28
30
2
0.7
0.7
0.7
0.6
0.5
0.3
3
1.0
1.0
1.1
1.0
0.8
0.6
4
1.3
1.4
1.4
1.3
1.1
0.8
5
1.7
1.7
1.8
1.6
1.4
1.1
6
2.0
2.0
2.1
2.0
1.7
1.4
7
2.3
2.4
2.5
2.3
2.0
1.7
8
2.6
2.7
2.8
2.6
2.3
2.0
9
2.9
3.0
3.2
3.0
2.7
2.3
10
3.2
3.3
3.5
3.3
3.0
2.6
SRK/T formula HYPEROPIC keratorefractive surgery IOL power adjustment table based
on the Aramberri "double K method."
The numbers in each row of refractive correction represent the amount in diopters
that must be SUBTRACTED FROM the calculated IOL
power when using the SRK/T 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
0.7
0.7
0.7
0.6
0.4
0.0
3
1.1
1.1
1.1
0.9
0.5
0.0
4
1.4
1.4
1.5
1.2
--
--
5
1.8
1.8
1.9
1.7
--
--
6
2.2
2.2
2.5
--
--
--
These 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.
Formula
