CooperVision Frequency contact lenses offer high oxygen permeability, which ensures these lenses provide a high degree of healthy comfort. Frequency 55 lenses include UV radiation blocking to protect against formation of cataracts. Frequency Aspheric lenses are specially designed to correct spherical aberrations of the eye. Frequency XCEL Toric lenses are the perfect comfort solution for those with astigmatism. CooperVision Frequency products all meet the highest quality standards and receive excellent feedback from eOptika customers.