In fact, I would say it's probably too low! Like, how is prescription glasses to correct vision not an assistive device for a disability, like poor eyesight?
Honestly, what's the difference between a wheelchair and prescription glasses? Both are medical devices prescribed be a healthcare professional to assist with a physical impairment.
What's the difference between glasses and an iron lung? Only the degree, severity, dependance, impact, consequence, social implication, dehumanization, and every other meaningful aspect!
And yet, if someone cannot meaningfully participate in society without their glasses, then yes, they have a disability. Polio paralysis and vision loss are both examples of disability. They do have differences in all those things you mentioned, and yet, are both disability.
> Honestly, what's the difference between a wheelchair and prescription glasses?
Taking the silly question seriously for a moment: the difference is that with prescription glasses, you can function just exactly like someone who doesn't need them. Once you are wearing the glasses, your ability to do pretty much anything is unimpaired. Whereas a wheelchair restores some mobility, but does not, for example, impart the ability to climb stairs. It does not give you back all the mobility of someone who doesn't need one.
Might as well throw bald people in there because not having hair can be a disadvantage in the dating scene.