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optical axis
This term is a technical specification used primarily in physics, ophthalmology, and optical engineering. It describes a geometric ideal rather than a physical object, serving as the reference line for calculating focal points and measuring distortions like coma or astigmatism.
In clinical settings, such as eye exams, the optical axis is distinguished from the visual axis. While the optical axis is a purely structural line based on the lens geometry, the visual axis is the actual path light takes from a point of fixation to the fovea, meaning the two lines rarely coincide perfectly in a human eye.
Meanings
Examples
The light ray traveling along the optical axis passes through the lens without being deflected.
Make sure the sensor is perfectly aligned with the optical axis of the lens.
In a perfect lens, the optical axis is the line of rotational symmetry.
Wait, is the laser beam shifted away from the optical axis?
The doctor explained that the visual axis is slightly different from the optical axis of the eye.
I need to adjust the mirror to ensure it sits exactly on the optical axis.
Spherical aberration occurs when rays far from the optical axis focus at different points.
The telescope must be calibrated so that the eyepiece is centered on the optical axis.