Which stabilization method uses a minus carrier to prevent prism in the visual axis?

Which stabilization method uses a minus carrier to prevent prism in the visual axis?

• A. Prism ballast method
• B. Peri-ballast method
• C. Dynamic stabilization
• D. Accelerated/blink stabilization design

Answer: (B)

Stabilizing toric lenses relies on counteracting forces that tend to rotate the lens on the eye so the correct meridian stays aligned with the visual axis. In the peri-ballast approach, stability comes from a ballast around the lens edge plus a minus carrier in the central region. The minus carrier provides a slight negative power that offsets the prismatic effect created by the ballast, so prisms don’t creep into the visual axis as the eye moves or blinks. This balancing act keeps the toric axis more consistently in view, improving rotational stability without introducing unwanted prism into the line of sight. Other methods rely on different mechanisms—prism ballast uses prism to stabilize, dynamic stabilization responds to eyelid movement without a central negative carrier, and accelerated/blink stabilization designs focus on quick realignment during blink—so they don’t employ the minus-carrier balancing approach described here.

Stabilizing toric lenses relies on counteracting forces that tend to rotate the lens on the eye so the correct meridian stays aligned with the visual axis. In the peri-ballast approach, stability comes from a ballast around the lens edge plus a minus carrier in the central region. The minus carrier provides a slight negative power that offsets the prismatic effect created by the ballast, so prisms don’t creep into the visual axis as the eye moves or blinks. This balancing act keeps the toric axis more consistently in view, improving rotational stability without introducing unwanted prism into the line of sight. Other methods rely on different mechanisms—prism ballast uses prism to stabilize, dynamic stabilization responds to eyelid movement without a central negative carrier, and accelerated/blink stabilization designs focus on quick realignment during blink—so they don’t employ the minus-carrier balancing approach described here.