What stabilization technology keeps Precision1 for Astigmatism correctly oriented on the eye?

What Stabilization Technology Keeps Precision1 for Astigmatism Correctly Oriented on the Eye?

Keeping a toric lens correctly oriented is the central engineering challenge in daily toric lens design. Precision1 for Astigmatism uses Alcon's PRECISION BALANCE 8|4™ stabilization design to achieve this.

Why Toric Stabilization Matters

A toric lens must maintain a specific rotational orientation to deliver accurate astigmatism correction. If the lens rotates from its correct position, the cylinder power misaligns with the axis of the astigmatism — causing blurred or distorted vision. Contact lenses naturally move with blinking and eye movement, so the stabilization mechanism must ensure rapid re-orientation after any displacement.

How PRECISION BALANCE 8|4™ Works

PRECISION BALANCE 8|4™ creates thin zones specifically at the 8 o'clock and 4 o'clock positions on the lens — positioned to interact with the natural resting position of the upper and lower eyelids. The forces generated by blinking orient and hold the lens in the correct rotational position. The 8|4 designation refers to the specific clock positions of the thin stabilization zones — a design refined to work with the anatomy of a wide range of eye shapes and lid geometries. The stabilization mechanism works continuously with every blink, actively re-orienting the lens thousands of times throughout the wear day.

Performance and Adaptation

An adaptation period of a few days is normal for new toric lens wearers as the stabilization mechanism settles into its optimal position for individual eye anatomy. If blurred or unstable vision persists beyond 2 weeks, consult your eye care professional for reassessment.