http://www.contactlensjournal.com/article/S1367-0484(17)30099-1/fulltext?rss=yes

Surface coverage with single vs. multiple gaze surface topography to fit scleral lenses

ABSTRACT

Until very recently, scleral lens fitting has depended upon the use of a diagnostic fitting set utilizing a trial-and-error process. Scleral lens base curve selection is not predictable using keratometry measurements from corneal topography [1]. The shape of the anterior sclera is necessary to measure two critical parameters key to scleral lens fitting: the sagittal height of the eye (SAG) at the diameter of the scleral lens [2] and the amount of scleral toricity. SAG is necessary to determine the appropriate base curve of a scleral lens to achieve a desired central clearance of the lens to ocular