There have been several occasions where health authorities have regarded rigid flat foot as a disability, especially in the older population. Those people who have severe deformities, callosities that have formed around their foot bones, and who cannot walk without experiencing excruciating pain have been given disability certificates. Especially for rigid flat feet, disability percentage has been marked as high as 30%.    Children with congenital flat feet due to known or unknown causes and people for whom physical therapy management has not been proven beneficial are also eligible for disability certificates. Since the features of flat feet and arches vary from person to person, the amount of disability that affects them is also different. In some cases, even a rigid flat foot might not be considered a disability.