Department of Optics, University of Granada, Granada, Spain.
Department of Optics, University of Granada, Granada, Spain.
Exp Eye Res. 2019 Aug;185:107674. doi: 10.1016/j.exer.2019.05.014. Epub 2019 May 24.
Aniseikonia has demonstrated to deteriorate the binocular function, however its impact on the accommodative response remains unknown. The present study aimed to analyze the effects of artificially-induced aniseikonia, using afocal magnifiers, on the dynamics of the accommodative response. The magnitude and variability of the accommodative response were objectively measured in 20 young healthy subjects by a binocular open-field autorefractometer. Participants observed a static stimulus for 90 s, under seven degrees of aniseikonia (0%, 1%, 3%, 5%, 8%, 10% and 12%), and at three distances (500 cm, 40 cm and 20 cm). Complementarily, near stereoacuity, and perceived levels of fatigue and visual discomfort were assessed. The degree of induced aniseikonia was associated with the magnitude of the accommodative response (p < 0.001, η = 0.329), obtaining a statistically significant reduced accommodative lag for the induced aniseikonia conditions of 8%, 10% and 12% in comparison to the control condition at 40 cm (p-corrected = 0.019, <0.001 and 0.013, respectively) and at 20 cm (p-corrected < 0.001, <0.001 and 0.003, respectively). However, the degree of induced aniseikonia did not reveal any effect on the variability of accommodation (p > 0.05). We also found a decline in near stereoacuity and an increment of visual symptomatology when inducing aniseikonia (p < 0.05). Our data evidenced that greater degrees of induced aniseikonia cause a heightened accommodative response. These preliminary findings may be of relevance for patients undergoing cataract or refractive surgery procedures in which aniseikonia can be induced.
交叉视差已被证明会降低双眼功能，但它对调节反应的影响尚不清楚。本研究旨在分析使用无焦度放大镜人为诱导交叉视差对调节反应动力学的影响。通过双目开放式自动折射计，对 20 名年轻健康受试者的调节反应幅度和可变性进行了客观测量。参与者在 7 度交叉视差（0%、1%、3%、5%、8%、10%和 12%）和 3 个距离（500cm、40cm 和 20cm）下观察静态刺激 90s。此外，还评估了近立体视锐度以及疲劳和视觉不适的感知程度。诱导的交叉视差值与调节反应幅度相关（p<0.001，η=0.329），与对照条件相比，8%、10%和 12%的诱导交叉视差条件在 40cm（p-corrected=0.019、<0.001 和 0.013，分别）和 20cm（p-corrected<0.001、<0.001 和 0.003，分别）时获得了统计学上显著的调节滞后减少。然而，诱导的交叉视差程度对调节的可变性没有影响（p>0.05）。当诱导交叉视差时，我们还发现近立体视锐度下降和视觉症状增加（p<0.05）。我们的数据表明，更大程度的诱导交叉视差会导致调节反应增强。这些初步发现可能与接受白内障或屈光手术的患者有关，在这些手术中可能会引起交叉视差。
