Final answer:
Fixation disparity indicates a misalignment of the eyes when focusing on an object, leading to possible visual discomfort and headaches. It happens when the eyes focus on different spatial points. It is related to binocular vision dysfunction, not atmospheric aberrations.
Step-by-step explanation:
The presence of a fixation disparity suggests that there is a misalignment of the eyes when focusing on an object. This condition can lead to symptoms such as visual discomfort, headaches, and difficulty with depth perception. Fixation disparity occurs when the eyes are aimed at slightly different points in space, rather than the same point, which can be indicative of a more significant underlying issue such as binocular vision dysfunction.
In the context of atmospheric aberrations, someone might describe the difficulty in visually resolving separate bodies in the sky due to the blurring effect as similar to a fixation disparity. However, the use of the term 'fixation disparity' in this context would technically be incorrect, as fixation disparity specifically refers to a binocular vision issue, not atmospheric effects on visibility.