Control of contact lens movement and rotation is crucial for toric lenses fitted to corneal shapes, indicating optimization strategies.
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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Tomlinson et al. (1980) studied this question.
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