visual fixation的用法和樣例：
例句
- Forty-four percent of eccentric fixations were changed to central fixation and 32% of the central scotomas were removed.
輕度弱視療效好，注視性質越靠近中心凹療效越好。 - This will not only serve as a tracker, but it will also serve as a pacer for maintaining consistent speed and decreasing fixation duration.
這樣筆就不僅是一個追蹤器，而且還是定速器，能幫助維持恆定的速度，同時還能縮短注視時間。
