Stereoacuity and Aniseikonia: Evaluation Before and After Bilateral Implantation of Three Types of Presbyopia-Correcting Intraocular Lenses in Uncomplicated Phacoemulsification with Due Consideration of Interocular Differences in Higher Order Aberrations, Axial Lengths, Refractive Errors, and Acuities

Purpose: To determine if the changes in stereoacuity and aniseikonia, following bilateral implantation of presbyopia correcting intraocular lenses could be predicted from preoperative measurements of higher order aberrations (HOAs), axial lengths (AL), refractive errors (RE) and corrected visual acuities (CVAs). Patients and Methods: Stereoacuity (Randot tests, @6m b) some significant intergroup differences in SAD, SAN c) at 6 months postop, changes (Δ=pre- minus postoperative value) correlated with preoperative values (x). Linear regression revealed, I ΔSAD=0.66x-57.47 0.832, ± 66.4, ΔSAN=0.96x-34.59 0.821, ± 16.9, ΔA R =0.93A R -2.12 0.795, ± 1.4 II ΔSAD=0.79x-62.91 0.916, ± 38.1, ΔSAN=0.96x-31.49 0.892, ± 8.0, ΔA R =0.91A R -0.91 0.839, ± 1.3 III ΔSAD=0.67x-35.50 0.991, ± 23.7, ΔSAN=0.88x-38.510.988, ± 10.6, ΔA R =0.86A R -0.96 0.900, ± 1.3. Figures in parentheses are the corresponding rs and ±limits of agreement between actual and estimated values. Definitive overarching associations connecting interocular differences in HOAs, AL, RE, and CVAs with SAD, SAN and A R were not found. Conclusion: Changes in stereoacuity and aniseikonia can be predicted using preoperative values. ΔSAN can be predicted within ± 1, and ΔA R within ± 2, scale divisions. In group III ΔSAD can be predicted within ± 1, and in group I ± 3, scale divisions. Keywords: presbyopia-correcting intraocular lenses, aberrometry, stereoacuity, aniseikonia