I am asked for solutions for mobility issues from time to time. When the mobility gets significantly worse, one consideration is a mouse that is controlled with your eyes. There are a number of solutions before you get to that point. The problem is none of them seem perfect. It is painful to watch someone struggling in this area, especially if it gets worse over time. That fact that you can use a joystick for a computer or tablet is a better answer in some cases. The problem is there is no answer that is going to make you feel great. We all want to make it better. The truth is hindsight is 20/20. You only know after you use it. Even amazing assistive technology specialist cannot see the future. I often hear the line that “I want the perfect device for this child.” This is a popular line. That is why many states have programs that demonstrate technology or lone it to you. All vendors have return policies. There are a ton of options, and anyone can predict the best option each time should play Lotto. I suggest playing the devil's advocate and just being very good at what you do and always expect better.
Joystick
n-ABLER Pro Joystick (PC)
This mouse is easy to move the courser with a joystick.
J-Pad Bluetooth Joystick for iPad
You can control your iPad with this joystick mouse. It also has two buttons to help you perform different functions.
Two Companies to look at: