This is really like having cheap, off-the shelf reading glasses even though prescription reading glasses are available and attuned to your eyes. And folks woul

This is really like having cheap, off-the shelf reading glasses even though prescription reading glasses are available and attuned to your eyes. And folks would be interested for similar reasons. Insurance might not cover the testing that often or the device itself, for instance, or someone might not think they have the time to go to that doctor. Maybe it is only a problem every once in a while, and so on. And like cheap reading glasses, it might not be a perfect solution, but a solution nonetheless.