Possessing very thin corneas, which may become unstable when tissue is taken out to reshape them. This can lead to a significant complication often called corneal ectasia. Hellen Keller, who was both deaf and blind, mentioned, "The one thing worse than getting blind is having sight but no vision." At https://wekurehealth.com/blog/cataracts-what-to-expect-and-how-to-prepare-wekure-health/