FGA and Schnyder corneal dystrophy: These findings are further strengthened by a study conducted by Green et al. [86], who determined protein C activity, fibrinopeptide A, fibrinogen, and β thromboglobulin in SCD patients and found that they had significantly lower concentrations of protein C and higher levels of fibrinogen, fibrinopeptide A, and β thromboglobulin as compared to the control group.