Dostalek Miroslav, Fliegel Karel, Dusek Ladislav, Lukes Tomas, Hejda Jan, Duchackova Michaela, Hozman Jiri, Autrata Rudolf
Center of Paediatric Ophthalmology BINOCULAR, Litomysl; Czech Republic.
Masaryk University, Faculty of Medicine, Dept. Optometry and Orthoptics, Brno, Czech Republic.
J Eye Mov Res. 2019 Sep 11;12(4). doi: 10.16910/jemr.12.4.4.
The stability of fusion was evaluated by its breakage when interocular blur differences were presented under vergence demand to healthy subjects. We presumed that these blur differences cause suppression of the more blurred image (interocular blur suppression, IOBS), disrupt binocular fusion and suppressed eye leaves its forced vergent position. During dichoptic presentation of static grayscale images of natural scenes, the luminance contrast (mode B) or higher-spatial frequency content (mode C) or luminance contrast plus higher-spatial frequency content (mode A) were stepwise reduced in the image presented to the non-dominant eye. We studied the effect of these types of blur on fusion stability at various levels of the vergence demand. During the divergence demand, the fusion was disrupted with approximately half blur than during convergence. Various modes of blur influenced fusion differently. The mode C (isolated reduction of higher-spatial frequency content) violated fusion under the lowest vergence demand significantly more than either isolated or combined reduction of luminance contrast (mode B and A). According to our results, the image´s details (i.e. higher-spatial frequency content) protects binocular fusion from disruption by the lowest vergence demand.
通过在健康受试者的聚散需求下呈现双眼模糊差异时融合的破裂情况来评估融合的稳定性。我们推测这些模糊差异会导致对更模糊图像的抑制（双眼模糊抑制，IOBS），破坏双眼融合，并且被抑制的眼睛会离开其强制聚散位置。在自然场景静态灰度图像的双眼分视呈现过程中，向非优势眼呈现的图像中，亮度对比度（模式B）或更高空间频率内容（模式C）或亮度对比度加更高空间频率内容（模式A）会逐步降低。我们研究了这些类型的模糊在不同聚散需求水平下对融合稳定性的影响。在散开需求期间，融合被破坏时的模糊程度约为集合时的一半。不同模式的模糊对融合的影响不同。模式C（仅降低更高空间频率内容）在最低聚散需求下比单独或联合降低亮度对比度（模式B和A）更显著地破坏融合。根据我们的结果，图像的细节（即更高空间频率内容）可保护双眼融合在最低聚散需求下不被破坏。
