central visual axis

central visual axis

The sightline, which is perpendicular to the picture plane, indicating the direction in which the viewer is looking. See also: Perspective projection
References in periodicals archive ?
While the central fovea generally does not change its position, the temporal one is closer to the central visual axis in raptors with more frontally placed eyes.
Grade II PCO is present in the central visual axis, detectable in an undilated pupil.
The resultant abnormally-proliferative remnant LECs migrate to the posterior capsule, where they approach the central visual axis and cause visual-axis obscuration, resulting in diminution of vision which had been previously improved post cataract surgery.

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