For a study, which was built on previously reported findings, researchers sought to assess the prediction power of personalized eye models to pinpoint negative dysphotopsia (ND) in the peripheral field of view (PFoV). In prospective research done, post-operative biometrical data from five patients implanted with monofocal IOLs and suffering from ND symptoms were collected. A subjective Harms tangent screen approach was utilized to localize the observed shadow in PFoV (HvF). Individualized Liou-Brennan (non)-sequential eye models were developed utilizing the gathered biometrical data to compute theoretical retinal irradiance maps.
The average axial length was 22.83 (21.05 – 24.80) mm, the average IOL power was 24.4 (20.5 – 30.0) D, the average IOL tilt was -1.86 (-6.21 – 2.96) degrees, and the average decentration was 0.16 (-0.27 – 0.44) mm. The average difference in residual astigmatism between theoretical and observed data was 0.49 (0.02 – 0.97) D. The irradiance maps, when aligned with HvF data, localize ND in the peripheral visual field up to 85 degrees. Previous theoretical studies showed that, under equal biometrical settings, IOLs from different manufacturers with similar mechanical platforms but varied optic edge designs had equivalent ND profiles with peripheral shadow locations ranging from 69 to 76 degrees. The resulting findings illustrated the clinical significance of these eye models in terms of PFoV localization of ND, implying that they should be used more widely.
Reference:jov.arvojournals.org/article.aspx?articleid=2778473
