Effect of interocular differences on binocular visual performance after inducing forward scattering Martino, Francesco Castro Torres, José Juan Casares López, Miriam Ortiz Peregrina, Sonia Ortiz Herrera, Carolina Jiménez Cuesta, José Ramón Bangerter foils Binocular summation Fog filters Induced forward scattering Interocular differences Retinal image quality Research Projects PID2020-115184RB-I00, funded by MCIN/AEI/10.13039/501100011033, and A-FQM-532-UGR20, funded by FEDER/Junta de Andalucia-Consejeria de Transformacion Economica, Industria, Conocimiento y Universidades. Purpose: To assess binocular visual performance by means of binocular summation on visual function after inducing monocular forward scattering, and to study the influence of interocular differences on ocular parameters. Methods: Seven young healthy subjects were recruited. Four Bangerter foils and five fog filters were used to induce monocular forward scattering. To analyse the impact of the scatter, visual acuity, contrast sensitivity, visual discrimination capacity and distance stereoacuity were measured binocularly with the filter placed over the dominant eye. Additionally, interocular differences were calculated for four ocular parameters: the Objective Scatter Index (OSI), Strehl ratio (SR), modulation transfer function cut-off (MTF cut off) and straylight (log[s]). Binocular summation was determined for these visual functions. Results: A statistically significant deterioration in visual acuity, contrast sensitivity and stereoacuity was seen for all of the filter conditions with respect to the natural state (baseline), with the largest change being recorded for the Bangerter foils. Similarly, the interocular difference for the three retinal image quality parameters (OSI, SR and MTF cut-off) and log(s) increased significantly for the Bangerter foil condition, but not for the fog filters (except log(s)). Binocular summation declined gradually with the Bangerter foils, but not for the fog filters. Statistically significant correlations were found, that is, the greater the interocular differences, the lower the binocular summation of the visual functions and the greater the distance stereoacuity. Conclusion: Increased forward scattering in the dominant eye resulted in interocular differences, which reduced the overall binocular visual performance, including the binocular summation of several visual functions and distance stereoacuity. The results suggest that marked interocular differences in ocular parameters should be avoided in cases of ocular pathology, amblyopia and emmetropisation procedures (such as refractive surgery) or a monovision correction for presbyopia. 2022-05-16T12:16:52Z 2022-05-16T12:16:52Z 2022-05-02 info:eu-repo/semantics/article Martino, F... [et al.]. Effect of interocular differences on binocular visual performance after inducing forward scattering. Ophthalmic Physiol Opt 2022; 00: 1– 14. [https://doi.org/10.1111/opo.12992] http://hdl.handle.net/10481/74850 10.1111/opo.12992 eng http://creativecommons.org/licenses/by-nc/3.0/es/ info:eu-repo/semantics/openAccess Atribución-NoComercial 3.0 España John Wiley & Sons