What is this "Accessibility" menu on my MT3G Slide?

[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!!!