Are daily disposable toric soft contact lenses prism free in the optic zone?

Purpose: Rotational stability of toric soft contact lenses (TSCLs) is achieved using various designs. A previous study with reusable TSCLs found prism-ballast and peri-ballast designs have vertical prism in the central optic zone. An Eyelid Stabilised Design had significantly lower vertical prism than other TSCLs tested (ANOVA p < 0.001). More daily disposable (DD) TSCLs have since become available. This study quantifies vertical prism in DDTSCLs using the same methodology.