LASIK IOL Intraocular Lens Power Calculations Following Hyperopic LASIK - Post LASIK After LASIK Holladay 2 formula, LASIK and PRK IOL Intraocular Lens Power Calculations After Post Eye Cataract Surgery Eyes
Determining Corneal Power
Following Hyperopic LASIK.
For eyes that have undergone hyperopic LASIK, the central corneal power
estimation technique is much easier than for myopic LASIK. This is
thought to be due to the fact that the ablation takes place outside the
central cornea.
It has been our experience that the average of the 0 mm, 1 mm and 2 mm
annular power rings of the Numerical View of the Zeiss Humphrey Atlas
topographer is sufficiently accurate to serve as an estimate of central
corneal power following hyperopic LASIK.
As an alternative, Drs. Wang, Jackson and Koch have shown that the
effective refractive power (EffRP) of the EyeSys Corneal Analysis
System also works well.¹ Notice that this technique is very similar to
what is currently recommended for estimating the central corneal power
following radial keratotomy.
Remember that some form of a "double K method" is still required for
IOL power calculations following hyperopic LASIK in order to avoid a
refractive surprise. This can be done by checking the "Previous RK,
LASIK, etc." box on the Holladay 2 formula (contained within the
Hollday IOL Consultant), or by using a hyperopic "double K method" IOL
power correction table based on the work of Aramberri for any of the
three popular 3rd generation, 2-variable formulas as outlined in:
The initial results using this approach have been encouraging, with
very accurate outcomes employing the Holladay 2 formula.
Annular power ring values from the Zeiss Humphrey Atlas topographer.
References
1. Wang L, Jackson DW, Koch DD. Methods of estimating corneal refractive power after hyperopic laser in situ keratomileusis. J
Cataract Refract Surg. 2002; 28:954 - 961.
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