Mapping The Aspheric Characteristics Of The Boston Envision Contact Lens Using The EyeSys Corneal Topographer.

The Boston Envision contact lens is billed as a posterior aspheric design to improve fitting characteristics. A well fitting lens is a resource any practitioner would like
to have, yet the exact nature of the Envision's asphericity is regarded as "proprietary information". Using the EyeSys corneal topographer it was shown that there was only a
miniscule amount of asphericity present and we should not confuse this lens with a true aspheric lens. The calculated eccentricity of the 4 Envision lenses measured was minimal and likely clinically negligible.