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 ?
Grade III PCO is present in the central visual axis with 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.
Comparison of the presence or absence of PCO within the central visual axis or Nd: YAG capsulotomy rates [8][9] or PCO-induced loss of contrast sensitivity [10] or even PCO assessment on slit lamp-retro-illumination images are subjective comparisons, relying on the patients' perceptions of their visual morbidity and need longer follow-up before a conclusion can be derived.

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