Could a tooltip with the image description
![enter image description here]
be displayed when hovering over an image? This would make additional use, next to the one for visually impaired...
Just add hover text in parentheses:
: http://i.stack.imgur.com/..... (hover text)
or in quotation marks:
: http://i.stack.imgur.com/..... "hover text"
There's a good reason to have alt-text and hover-text as separate attributes: one is intended for users who don't see the image, the other for those who do.