From Veronica with Four Eyes: For Complete Post, Click Here…
A picture says a thousand words, and there are times that images on social media require more than a thousand characters to create an adequate description for people that are blind or that have low vision.
SHOULD I USE BOTH ALT TEXT AND IMAGE DESCRIPTIONS?
When posting an extended image description to accompany a photo or other content, I recommend including alt text for the image and indicating in the caption that an image description with more detail is available and shared in another section- do not post the link to the description in the alt text box. Make sure that the extended image description is easy to locate from the original post, as most users will not want to go searching for additional descriptive information.