What question did this study set out to answer?

This research aims to explore how different lens designs and fits affect the rotation of contact lenses on the eye.

March 21, 2026

Movement and Rotation of Soft Contact Lenses. Effect of Fit and Lens Design

Key Points

This research aims to explore how different lens designs and fits affect the rotation of contact lenses on the eye.
Measured lens rotation on 13 eyes fitted with three types of spherical lenses: regular, prism ballasted-truncated, and truncated only.
Varied edge lift in three steps to assess impact on rotation.
Tested lenses fitted with both flat and steep designs during blink events.
Rotation of lenses can be effectively reduced by decreasing the radius of the base curve.
Implementing truncation and/or prism ballast also decreases lens rotation.

Abstract

Abstract Control of the movement of a contact lens on the eye is of particular importance in the case of a toric lens fitted on a toroidal cornea. Lens rotation was measured on 13 eyes fitted with each of three types of spherical contact lenses, regular, prism ballasted‐truncated, and truncated only. Edge lift was varied in three steps, and lenses fitted flat and steep were tested for the amount of blink‐associated rotation. Rotation can be reduced by decreasing the radius of the base curve or providing truncation and/or prism ballast.

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