those whose mental or physical powers remain, even after treatment, considerably impaired.

If no special agreements are concluded between the Parties to the conflict concerned, to determine the cases of disablement or sickness entailing direct repatriation or accommodation in a neutral country, such cases shall be settled in accordance with the principles laid down in the Model Agreement concerning direct repatriation and accommodation in neutral countries of wounded and sick prisoners of war and in the Regulations concerning Mixed Medical Commissions annexed to the present Convention.