How does axis rotation affect vision in toric lenses and what stabilization features help?

How does axis rotation affect vision in toric lenses and what stabilization features help?

• A. Rotation misaligns the cyl axis, causing blur; stabilization features like ballast, periballast, or prism help maintain orientation.
• B. Rotation does not affect vision in toric lenses, stabilization isn't needed.
• C. Axis rotation improves vision with toric lenses.
• D. Stabilization features only affect comfort, not vision.

Answer: (B)

Toric lenses correct astigmatism by lining up a cylindrical correction with a specific axis on the eye, so any rotation around the visual axis shifts that alignment and produces blur or distorted vision. Stabilization features are built to keep the lens oriented correctly during blinking and eye movements. Ballast designs add weight at the bottom, using gravity to maintain upright orientation; periballast includes heavier zones around the edge to resist rotation; prism ballast combines a small prism with ballast to lock the axis in place. With the axis held steady, the cylinder power remains in the intended position, delivering crisp, reliable vision.

Toric lenses correct astigmatism by lining up a cylindrical correction with a specific axis on the eye, so any rotation around the visual axis shifts that alignment and produces blur or distorted vision. Stabilization features are built to keep the lens oriented correctly during blinking and eye movements. Ballast designs add weight at the bottom, using gravity to maintain upright orientation; periballast includes heavier zones around the edge to resist rotation; prism ballast combines a small prism with ballast to lock the axis in place. With the axis held steady, the cylinder power remains in the intended position, delivering crisp, reliable vision.