Warning: SPOILERS for Legends of Tomorrow, Season 5, Episode 11, "Ship Broken."
Legends of Tomorrow season 5, episode 11, "Ship Broken" confirmed that Sara Lance had developed the power to see the future, but revealed that she had also lost her sight. Interestingly enough, this places Sara within two categories of hero common to both superhero comics and mythology in general; the blind seer and the blind warrior.
The youngest daughter of Quentin and Dinah Lance, Sara Lance is perhaps the most popular of the original characters created for the Arrowverse. Whereas Oliver Queen spent "five years in Hell" learning the skills he would later use to save his city, Sara Lance spent six years struggling to survive as a captive of the mad scientist Anthony Ivo and training as an assassin under the tutelage of Ra's Al Ghul. She was later given the rare opportunity to leave the League of Assassins, returning home to become a protector of the innocent as Canary. Following her death and resurrection, she took on the alias White Canary and became one of the founding members of the Legends of Tomorrow, eventually becoming the Captain of the Waverider when Rip Hunter left the team.
Throughout all of this, Sara has held her own against metahumans and magicians alike, despite lacking any superpowers of her own. That changed in the Legends of Tomorrow episode "The Great British Fake Off," where Sara seemed to start seeing events play out just before they happened. This occurred twice before Sara lapsed into a coma. She woke up early on in the following episode, "Ship Broken," but quickly realized that she had been struck blind - an unfortunate consequence for being able to see the future.
Sara's precognition took on a new form in this episode, giving her horrific visions of her teammates's deaths whenever she touched anyone's hand, ala Johnny Smith in The Dead Zone. By the end of the episode, Sara had learned how to focus this ability, shifting her perspective to check on specific people while holding another person's hand. Through this, she was able to witness and then avert Mick Rory's death by hellhound while holding hands with John Constantine.
It's worth noting that the loss of her sight has not robbed Sara Lance of her ability to fight. When Sara protested Constantine's statement that he was glad he had her to protect him while facing the hellhound, he reminded her that she was blind, not deaf. Trained to fight while blindfolded, Sara was able to backflip over a prone Constantine and deliver an impressive midair kick to the hellhound as it tried to pounce on her. While she may not be on par with Daredevil just yet, Sara more than proved her worthiness to continue leading the Legends of Tomorrow.