Randomised controlled trial of corneal vs. scleral rigid gas permeable contact lenses for keratoconus and other ectatic corneal disorders

In cases of uncorrected regular and irregular astigmatism, the formation of an aqueous ‘lens’ in the post-lens tear film of rigid contact lenses neutralises 90 % of corneal astigmatism [1,2]. CoL bear on the cornea only, SL vault the cornea bearing entirely on the sclera, preventing detrimental mechanical interaction with the cornea [3]. CoL are considered the gold standard in the management of keratoconus [4]. Despite recent resurgence, SL use is limited to relatively few practitioners [3] managing advanced disease or as a problem solver for failed alternative contact lenses [5,6].

Source: Contact Lens and Anterior Eye - January 12, 2020 Category: Opthalmology Authors: Alexander Levit, Martin Benwell, Bruce J.W. Evans Source Type: research