Visual Editor for image description field missing

Hi, I would like to left align the image description text when editing an image so that the description shows left aligned in my photo album. Unfortunately I don’t see the Visual Editor above the text field. I just see the markup b-quote, ul, ol, li and so on but not the left, center, right, align buttons? “deactivate visual editor” in my profile is unchecked. Thank you for your help.