(1) I cannot hold the camera still with one hand so I would get blurry photos with many cameras. Cannon has cameras with Image Stabilization which corrects for movement that occurs when I press on the shutter button. (2) Instead of buying on-line, I went to a store so I could play with several different cameras. Going through sub-menus to choose different focus options was difficult with one hand. My Cannon Power Shot A1100 model has a round dial on top of the camera I can turn to different settings. I turn the dial so the arrow is pointing to the icon I want and I am done.
(3) I am one-handed so I had to learn to use 3 fingers of my sound hand to hold the camera while the index finger of my sound hand pushes the shutter button. (4) My sound left hand created another problem. Shutter buttons are always on the right so sometimes I get a photo with a finger partially covering the lens (bottom right corner of photo). I am saved by viewing the photo and reshooting if needed. (5) Impaired standing balance forces me to look at my surroundings to stay vertical. I hold the camera at arm's length and look at the LCD monitor so objects in my peripheral vision can show me if I am vertical. This is much safer than obscuring my vision by holding the camera to my face to look through the viewfinder. Bottom-Line: Anti-depressants do not just come in a pill