HELSINKI — A study showed that the functional response of corneal allogenic intrastromal ring segments is influenced by keratoconus morphology.It also demonstrated that the segments provide meaningful structural and functional improvements.At the European Society of Cataract and Refractive Surgeons winter meeting, Burcu Yakut, MD, said that the findings offer “guidance for patient selection and surgical planning.”The study, conducted by Aylin Klç, MD, and colleagues, compared visual, refractive and tomographic outcomes of corneal allogenic intrastromal ring segments (CAIRS) in patients with