Intraocular lens power calculation after intrastromal femtosecond laser treatment for XXXX : Theoretic approach.

@entity1 @entity6755 @entity10818
PURPOSE: To evaluate the accuracy of intraocular lens (IOL) power calculation after an intrastromal femtosecond laser procedure to treat @entity10818 using a theoretic approach. SETTING: International Vision Correction Research Centre, Department of Ophthalmology, University of Heidelberg, Heidelberg, Germany. DESIGN: Nonrandomized clinical trial. METHODS: Preoperatively and 12 months after intrastromal femtosecond laser treatment (IntraCor) of @entity10818 , biometry was performed by partial coherence interferometry (PCI) (IOLMaster). The postoperative keratometry (K) values and IOL power calculation formulas (Holladay I, Haigis, @entity6755 /T, Hoffer Q) were compared with results derived from the clinical history method, taking the manifest refraction change into account. RESULTS: The study enrolled 25 @entity1 (median age 54 years). Three eyes were excluded for age-related lens changes. The median spherical equivalent change in the other 22 eyes was -0.38 diopter (D). The median difference in K values between the clinical history method and PCI was -0.21 D, resulting in a median IOL power difference between -0.23 D ( @entity6755 /T) and -0.29 D (Haigis) (range -1.58 to +1.00 D). The IOL power was underestimated in 59.1% of cases with the Hoffer Q and 63.6% of cases with the Holladay I, Haigis, and @entity6755 /T. There was a difference of   0.75 D in 72.7% of eyes using the Holladay I, Haigis, and Hoffer Q and in 86.4% of eyes using the @entity6755 /T. Neither K values nor IOL power differences were statistically significant (P > .17). CONCLUSION: Intraocular lens power calculation using modern standard formulas incorporated in a PCI biometry device after intrastromal femtosecond @entity10818 treatment was reliable, with minimum underestimation on average.
