Poster Session I: Does stimulus image quality affect fixational eye movement characteristics?
Poster Session I: Does stimulus image quality affect fixational eye movement characteristics?
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海报会议 I：刺激图像质量是否会影响注视眼球运动特征？
DOI：
10.1167/jov.23.15.43
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发表时间：
2023
影响因子：
1.8
通讯作者：
Young LK
中科院分区：
文献类型：
--
作者：
Young LK
已经发现漂移与视敏度呈负相关（对于具有较低视敏度的观察者，扩散常数较高; Clark et.等人，2022）。然而，目前尚不清楚这是否反映了对眼部特征的长期调整，或者对图像质量的更动态调整。为了测试这一点，使用AOSLO测量注视眼球运动，并通过成像系统以30 Hz呈现刺激。通过模拟像差改变图像质量。五名参与者在三种条件下完成了翻滚E任务：无像差、参与者的自然像差和0.25 D散焦。在840 nm成像光上以543 nm的增量呈现1.2弧分的间隙宽度E，持续750 ms。条件随机交错，并在每次试验中给出反馈。正如预期的那样，性能最高，没有像差，其次是观察者的自然像差，散焦最差。然而，漂移特性（双变量轮廓椭圆面积，BCEA和扩散常数）没有变化，这表明在一个试验到试验的基础上漂移没有调整到刺激质量。为了测试漂移是否会随着时间的推移而调整，两名参与者在有序的试验中重复了实验。有序和随机试验之间的BCEA存在差异，但这些差异在参与者之间并不一致。我们将提出一个分析的差异，发现个人之间的光学像差存在于他们的眼睛。
Drift has been found to be inversely related to visual acuity (higher diffusion constants for observers with lower visual acuity; Clark et. al, 2022). However, it is not clear if this reflects long-term tuning to ocular characteristics, or a more dynamic adjustment to image quality. To test this, fixational eye movements were measured using an AOSLO and stimuli were presented through the imaging system at 30 Hz. Image quality was altered by simulating aberrations. Five participants completed a tumbling E task under three conditions: no aberration, the participant’s natural aberration, and 0.25 D defocus. A 1.2 arcmin gap width E was presented as a 543 nm increment on the 840 nm imaging light for 750 ms. Conditions were randomly interleaved, and feedback was given on each trial. As expected, performance was highest with no aberration, followed by the observer’s natural aberration and was worst for defocus. However, drift characteristics (bivariate contour ellipse area, BCEA, and diffusion constant) did not vary, suggesting that on a trial-to-trial basis drift was not tuned to stimulus quality. To test whether drift might be tuned over time, two participants repeated the experiment in ordered blocks of trials. There were differences in BCEA between ordered and randomised trials, but these were not consistent between participants. We will present an analysis of the differences found between individuals in terms of the optical aberrations present in their eye.