Due to the use of screen readers and magnifiers to aid users with visual impairments, standards have been set for the “Accessibility” of websites for these technologies. In the case of screen readers, the tool will be reading all of the text provided on your site. This is relatively simple with the exception of images. Screen readers can’t “read” and image except to identify it as an image, unless the author has titled and described it. A way to make your content more accessible is to remember to include title and short descriptions along with your images.
There are also tools available online to evaluate the accessibility of your site. IDI Web Accessibility Checker allows you to check both via URL and uploading a file. We’ve run this same check on Pressible and while the results appear as spots of code, and so can be difficult to decipher, however if you follow the link they provide, they go into some detail about improvements that can be made.