I am informed by the Revenue Commissioners that the qualifying provisions for the Disabled Drivers and Passengers Scheme are contained in Statutory Instrument No. 353 of 1994 (Disabled Drivers and Disabled Passengers (Tax Concessions) Regulations 1994). Regulation 3 sets out the medical criteria by which the eligibility on medical grounds of disabled persons who are severely and permanently disabled is to be assessed in order to qualify for the scheme. A person who is blind is not included in Regulation 3 and therefore could not qualify for the scheme.
Further information in respect of the Scheme can be found at the following link http://www.revenue.ie/en/tax/vrt/reliefs-exemptions.html#section4-10