Yes, you should be covered.
From Iberia web site:
Passengers with Reduced Mobility (PRM) In air transport, current legislation defines a person with a disability or a Passenger with Reduced Mobility (PRM) as "any person whose mobility when using transport is reduced due to any physical disability (sensory or locomotor, permanent or temporary), intellectual disability or impairment, or any other cause of disability, or age, and whose situation needs appropriate attention and the adaptation to his or her particular needs of the service made available to all passenger" (art. 2 of EC Regulation 1107/06).
"Transfers and accompaniment in airports. Transit through airports on occasions requires walking long distances or walking through installations that you are unfamiliar with and which may tire and/or disorient you."
That being said, you need to call the airline to let them know that you will be flying with them and that you are visually impaired, and you will probably be asked to come to the airport earlier, and you will (most) probably be escorted to at least to the departure gate by a airport staff, and there be escorted in the plane by the airline staff.