Miniture camera and video

I'm attempting to build a sight system for my stepson who has dettached retina's due to complications at birth. What I envision is two miniature cameras with two miniature screens with a zoom and focus control for each. I have limited electronic knowledge. Can anyone point me in a direction?

Try taking a look at the Pixy Camera. If you want something smaller, but not quite as robust, then there is a large selection of miniature board cameras for Raspberry Pis.

You don’t want to use Arduinos for video processing. If anything, you need a Raspberry Pi instead.