Why this exists β David's Story
"If even the most basic pleasures are taken away, where does the weight of life rest?"
This software was built because of David
In my career as an assistive technology evaluator, David Chang's story β a person with cervical spinal cord injury (SCI C-level) β is one that has left the deepest impression on me.
When I first met David, he was in bad shape. The spinal cord injury from a car accident had stripped him of control over his body, leaving him entirely dependent on his wife around the clock. In that small room, what was trapped wasn't only David's immobilized body β it was also the unbearable pressure on his wife. As an occupational therapist, I knew my job wasn't just to help him "maintain vital signs," but to help him reclaim the feeling of having a life.
To help him reconnect with the world, we tried to secure a head-mouse for him through charitable funding. But we ran into a wall. We sensed that wheelchairs and electric beds β "traditional" assistive devices β were gladly supported. The moment we mentioned a "mouse," though, the room cooled: that was entertainment, not a basic necessity.
That gap in social perception struck me deeply. Many people think a person with a severe disability just needs to survive and be able to move β in those early days, David could barely move his neck at all. They overlook the fact that enjoyment and autonomy are often what keep a person going. For David, browsing the web, watching videos, and chatting with the outside world by typing β these weren't luxuries. They were the only tiny window through which he could reclaim any sense of control over his own life.
Fortunately, we didn't give up. We eventually found other resources and managed to get David his head-mouse hardware.
But once the hardware was in place, the real challenge emerged on the software side.
We started with point-n-click software. To be fair, it's powerful and full-featured β but for a non-technical family caregiver, the advanced settings were simply too complex. David's wife was already exhausted from daily caregiving; she couldn't reasonably be expected to fine-tune layer upon layer of configuration.
What made it even more disheartening was that we went through round after round of testing and adjustment with David. Even after painstakingly getting everything configured, the software still produced uncontrolled auto-clicks. Imagine the scene: David finally gets a video to start playing, full of expectation β and the screen keeps cycling through play, pause, play, pause (play/pause/play/pause) in an endless loop.
Watching the hope in his eyes turn to helpless frustrationβ¦
"Why don't we just build our own?" The thought surfaced.
We decided to build a tool centered on subtraction design and named it "david-mouse" after him. We put all the focus on UI/UX β keeping only the most essential, most-used features. The goal was clear: the user and their family should be able to set it up intuitively, without always waiting for a professional to come help. We even added multilingual support, because our quiet hope was that not just David, but other SCI patients anywhere in the world could download it for free and reclaim their digital autonomy.
After "david-mouse" was finished, David's life genuinely changed.
He can now navigate the web and find entertainment on his own, using just subtle head movements. Not only did this give his wife room to breathe β more importantly, the light in David's eyes came back. The irritable, depressed David slowly faded, because that small mouse had given him back the feeling of being in control. He found the motivation to try more: he pushed himself to speak louder and more clearly; he started wanting to sing; he wanted to control more things through his own effort.
This vitality pushed us forward too. Riding that wave of motivation, we later helped modify his electric wheelchair's controller. Today, David can confidently take himself out in his wheelchair on his own.
From a tiny cursor on a screen to a wheelchair moving freely in the real world. "david-mouse" may be just a simple piece of software, but for David, it was the key to restarting his life β and the gift we want to give to people with spinal cord injuries everywhere.
