If you were blind or disabled on the last day of the tax year, you are eligible for an additional exemption. If you are filing a joint return, an additional exemption is also available if your spouse/civil union partner was blind or disabled on the last day of the tax year. This exemption is not available for a domestic partner or for your dependents. "Disabled" means total and permanent inability to engage in any substantial gainful activity because of any physical or mental impairment, including blindness. You must enclose a copy of the doctor's certificate or other medical records with your return the first time you claim the exemption(s). This information need not be submitted each year provided there is no change in your condition.