Every cruise line places a high priority on providing the appropriate assistance you need. Many cruise ships use the latest technology to offer a variety of services and amenities for guests with visual, hearing or physical limitations, increasingly adapting its ships to cater for the needs of disabled passengers, with specially designed cabins and toilets, panic buttons, facilities for guide dogs and aids for the hard of hearing.
Cruising is, in many ways, an excellent option for the wheelchair-bound because it takes people to a variety of destinations without the worry of transferring baggage and checking into and out of a succession of hotels.
Above all, always take a travelling companion with you (most cruise lines will require this anyway). The ship's crew will help out as much as they can but the presence of a person who understands your specific needs will make the cruise experience much more comfortable - and a lot more fun!
Be aware that most ships only have a handful of specially adapted disabled cabins and they fill quickly, so do plan your cruise well ahead.