Rotational characteristics of toric contact lenses

Comparison of fitting stability of the different soft toric contact lenses

“…[5,6] These designs include two commonly used methods; Prism-ballasted design that involve interaction primarily from the upper lid and Non prism-ballasted design which both eyelids play an active role in stabilization. [6,7] The stabilization methods used in some of the toric soft contact lenses are: Prism ballast (Pure Vision Toric), Precision balance (Air optix for astigmatism), Prism ballast (Proclear Toric), Optimized Ballast Design or Equi ballast design or Horizontal iso-thickness design (Biofinity Toric), Accelerated stabilization design (ASD) (Acuvue Advance for Astigmatism). [8] The first Four lenses have prism stabilized designs, two of which (Air Optix for Astigmatism (Alcon) and Biofinity Toric (CooperVision)) incorporate modifications to avoid interaction with the bottom lid.…”

Low toric soft contact lens acceptance study

“…Improving stability has been an important principle in the evolution of toric soft lens development. In fact, rotational stability has been shown to be the main factor that determines whether a patient is successful in toric contact lenses [13]. Stabilization methodology can influence this, as can the fitting relationship.…”