Toric Lenses Practice Test

Toric lenses must stay oriented at a specific axis to correctly correct astigmatism. When a toric lens fits flat, it doesn’t engage the surface of the eye and the eyelids enough to lock its position. That lack of stabilization lets the lens rotate freely and unpredictably, so it doesn’t return reliably to the axis. You’ll often see the orientation markings move around on the eye, even without blinking, and vision will be fluctuating as the lens rotates. So the characteristic behavior is an unstable, inconsistent axis rather than a quick or slow, steady return.