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[Possible Influencing Factors for the Prediction of Postoperative Visual Acuity Gain after Retroiridal Iris Claw Lens Implantation].

PURPOSE
To determine effect sizes for visual acuity (VA) and visual acuity gain (ΔVA, pre- to postoperative) after the implantation of retroiridal Verisyse iris-claw lenses.


MATERIALS AND METHODS
Nineteen eyes of 19 patients (mean age of 70 ± 17 years) who underwent retoriridal iris claw lens implantation were included. Inclusion criteria were a lack of capsular support and complete data of pre- and postoperative corrected visual acuity, optical biometry, accompanying diseases and previous surgical intervention. A generalized linear model was established with postoperative visual acuity and visual acuity gain as dependent variables. Effect sizes were pseudoexfoliation syndrome, trauma, sex, previous surgical interventions as factors and axial length, average keratometry and corneal astigmatism as covariates.


RESULTS
The mean visual acuity improved from 0.72 ± 0.65 logMAR preoperatively to 0.36 ± 0.39 logMAR postoperatively (ΔVA 0.36 ± 0.69 logMAR). The average refractive IOL power was 19.4 ± 4.9 dpt. For modelling of VA/ΔVA the axial length (p = 0.001)/axial length (p = 0.001) and preop VA (p < 0.001) were tailored out as effect sizes.


CONCLUSIONS
The axial length and preoperative VA affect postoperative visual acuity and visual acuity gain significantly. In eyes with lower preoperative visual acuity and in longer eyes larger visual acuity gain can be expected after retroiridal iris claw lens implantation.