The length of the visual axis was the distance from the corneal vertex to the macular fovea, and it was also measured by A-mode ultrasound in sitting position with different ultrasonic velocity.
以角膜顶点至黄斑中心凹距离作为视轴长度，此连线上测量硅油后间隙的厚度。
Though central green axis is important to produce visual effects, form spatial pattern, and provide ecological benefits in the central area of a city, it still has plenty of problems.
虽然中心绿轴对于城市中心区视觉效果、空间结构、生态效益等方面都有重要的作用，但是仍存在众多的问题。
This paper USES a method of stable platform to achieve visual axis stability, the vibrating on visual axis brought by mobile carrier.
针对载体运动会给视轴带来影响，提出利用稳定平台实现视轴的稳定。
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