According to the Daily Mail, for the debate Hillary requested a step-stool. Apparently she wanted to appear taller, next to Donald Trump. The request was turned down.
In addition, during the debate there will be no commercial breaks allowed for coughing, et al. Whatever ails Hillary (and the Drudge Report has myriad theories on that) will have to be kept under control during the entire debate. That, of course, includes Hillary's left eye.
Here is the Daily Mail article which the Drudge Report links to.