What is "Accessibility" in Settings?

[AnAm85]

I have a myTouch 3G Slide and I noticed when I go into my "Settings" and scroll down towards the bottom there is a tab that says "Accessibility". When I go to it, it has a tab that says "Accessibility" and a box thats unchecked, but is darkened and I can't "click" or "touch" it to change the option. WHAT IS THIS? Does it have something to do with Rooting? Somebody please help me figure this out!!!

 

[ButteredToast]

Accessibility is for if you have some kind of disability or impairment. Like if you have bad eye sight it might change the color scheme or make text larger, or if you need to use a hearing aid, etc.

It's also greyed out on my phone, so I wouldn't know how someone would use it.