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SRK/T 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 SRK/T 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 SRK/T Formula.
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 | |
After HYPEROPIC Keratorefractive Surgery
IOL Power Adjustment Table for SRK/T 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 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 |
-- |
-- |
-- | |
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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