The Need for Scleral Lenses I would not presume to talk about corneal contact lenses here in America. You have a vast experience of their use and are well aware of their limitations as applied to what may be called "cosmetic" cases. By this I mean such patients as can see adequately with spectacles but prefer not to wear them. A considerable proportion of prospective corneal contact lens wearers prove unsuitable. Higher degrees of refractive error, particularly astigmatism, present difficulties which are often insuperable. In many cases these lenses have to be worn for a single period during the day, ending preferably with bedtime, because, when the lenses are removed and spectacles put on, "spectacle blur" makes work difficult or impossible for an hour or more. This is not very important for cosmetic cases but is a serious objection if contact lenses are necessary to give adequate vision. Unless allday