Rehabilitation Workers are trained to broad criteria laid out within the Sensory Services National Occupational Standards (NOS). The NOS were published in 2008 by Skills for Care and are available here https://socialcare.wales/nos-areas/sensory-services
Four of the eleven standards relate directly to rehabilitation work and working with deafblind people. Standard nine is the most relevant to defining the skill-set of rehabilitation work. More details on the members-only page.
Visual Impairment Benchmarking Standards for Employers
In 2006 the Welsh Local Government Association published the Visual Impairment Benchmarking Summary Report. It was intended to: develop service and practice standards that can be recommended nationally; and help local government understand current levels of capacity and provide evidence of service impact and outcomes.
As part of the project four good practice guides were published. Number 3 relates directly to Rehabilitation.