If he's in the UK, he might be interested in checking out the Disabled Photographers' Society. It's a charity run by disabled photographers to help make photography accessible for disabled people.
If he's from elsewhere, unfortunately they aren't able to accept members outside of the UK, but their website might be a useful starting point to get some ideas of what kind of adaptations are out there. Link below specifically to the page on adaptations. Might be worth seeing if there's any similar charities or groups in your own country/area too.
If he's in the UK, he might be interested in checking out the Disabled Photographers' Society. It's a charity run by disabled photographers to help make photography accessible for disabled people.
If he's from elsewhere, unfortunately they aren't able to accept members outside of the UK, but their website might be a useful starting point to get some ideas of what kind of adaptations are out there. Link below specifically to the page on adaptations. Might be worth seeing if there's any similar charities or groups in your own country/area too.
https://www.the-dps.co.uk/adaptations-2/