A good first step is to contact disability-support or assistive-technology organizations rather than only camera sellers. These groups often know about accessible products and can recommend solutions based on the person’s exact mobility limits.

For the camera itself, prioritize simple operation: few controls, a large rear screen, easy automatic modes, and a body that is durable or impact resistant. Since one-handed use is important, it may help to look for models that can be operated comfortably with the left hand and don’t require complex button combinations.

Because needs vary a lot, the best choice will depend on exactly what movements your friend can still make. An assistive-technology specialist may also know about adaptations or accessories that make standard cameras easier to handle.

You may also find it useful to search discussions specifically about one-handed camera use for disabled photographers, as others have shared practical experiences and recommendations.