Noh Jae-Hyeon, Kim Sang-Yeob, Moon Byeong-Yeon, Cho Hyun Gug, Yu Dong-Sik
Department of Optometry, Kangwon National University, Samcheok 25949, Republic of Korea.
Life (Basel). 2025 Apr 26;15(5):703. doi: 10.3390/life15050703.
Herein, we investigated changes in fixation stability between the right and left eyes during binocular and monocular viewing in young adults without strabismic binocular vision disorders. Fixation stability was assessed using the bivariate contour ellipse area (BCEA) in 34 healthy participants (15 males, 19 females) in their 20s. Eye-tracking was performed under three conditions: binocular viewing, monocular viewing, and monocular occlusion. Under these conditions, the median BCEA (deg) values for the right and left eyes were 0.95 and 0.75, 1.07 and 0.86, and 1.62 and 1.32, respectively. Fixation stability did not differ significantly between the right and left eyes under the same viewing conditions. However, the left eye demonstrated greater fixation stability under binocular viewing (closed loop/both eyes open) than the right eye under monocular viewing (open loop/one eye closed). Participants with a dominant left eye in binocular viewing had higher fixation stability than those with a dominant right eye. During monocular occlusion, the nondominant eye showed better fixation stability than the dominant eye. A significant quantitative correlation was observed between phoria and fixation stability in the left eye during binocular viewing. These findings show that fixation stability changes with different viewing conditions and is affected by which eye is covered. Therefore, when conducting tests such as ocular alignment, which involve covering one eye, it may be helpful to assess both right and left eye occlusion for ensuring a more comprehensive analysis.
在此，我们研究了无斜视性双眼视觉障碍的年轻成年人在双眼和单眼注视时左右眼之间注视稳定性的变化。使用双变量轮廓椭圆面积（BCEA）对34名20多岁的健康参与者（15名男性，19名女性）的注视稳定性进行评估。在三种条件下进行眼动追踪：双眼注视、单眼注视和单眼遮挡。在这些条件下，右眼和左眼的BCEA中位数（度）值分别为0.95和0.75、1.07和0.86、1.62和1.32。在相同注视条件下，左右眼之间的注视稳定性没有显著差异。然而，在双眼注视（闭环/双眼睁开）时，左眼表现出比单眼注视（开环/单眼闭合）时的右眼更高的注视稳定性。在双眼注视中左眼占优势的参与者比右眼占优势的参与者具有更高的注视稳定性。在单眼遮挡期间，非优势眼显示出比优势眼更好的注视稳定性。在双眼注视期间，左眼的隐斜与注视稳定性之间观察到显著的定量相关性。这些发现表明，注视稳定性随不同的注视条件而变化，并受遮盖哪只眼睛的影响。因此，在进行诸如眼位对准等涉及遮盖一只眼睛的测试时，评估左右眼遮挡可能有助于确保进行更全面的分析。
