"With more than 39 million people who are blind, and over 246 million who have a severe visual impairment, many people may feel excluded from the conversation around photos on Facebook," Facebook's Shaomei Wu, Hermes Pique, and Jeffrey Wieland, said in an online post, late Monday.
"We want to build technology that helps the blind community experience Facebook the same way others enjoy it."
Screen readers are software programs used by people with poor vision, which can scan text shown on screens and then convert the information into speech or braille.
Before the announcement, screen readers would only be able to tell users who posted the Facebook post and that an image was uploaded.
However, the tool will now able to say what the image may contain, from simple objects like "car" to "three people, smiling, outdoors". Currently, the software can identify around 100 types of objects and scenes, including those associated to nature, sports and transportation.