Demi Lovato woke up legally blind after a drug overdose, and has trouble seeing to this day

• In Demi Lovato's docuseries, she says she was legally blind following her heroin overdose in July 2018.
• In addition to blindness, Lovato suffered a heart attack and three strokes from her overdose.
• Lovato has gained much of her vision back, but still has trouble seeing things.

Demi Lovato revealed she became legally blind following her near-fatal drug overdose in July 2018 in her YouTube documentary "Demi Lovato: Dancing with the Devil."

After overdosing on heroin, Lovato experienced a heart attack and three strokes. Then, when she woke up in the hospital, she couldn't see. Doctors declared her temporarily legally blind.

During the four-part docuseries, the "Sorry Not Sorry" singer recalled waking up and feeling someone holding her hand. It was her sister, but Lovato had no clue at the time because of her vision loss.

Two months following Lovato's hospitalization, she was able to read a book again, the New York Times reported.

Though Lovato has gained back much of her eyesight, she has lingering vision impairment.

For example, Lovato told the documentary producers she often pours water outside of her drinking glass because she can't see it. When she looks straight ahead, blind spots cloud Lovato's vision, so she often uses her peripherals to look at her phone. Other times, she'll use voice messages to text others, according to the Times.

"It was interesting how fast I adapted," Lovato told Times reporter Caryn Ganz. "I didn't leave myself time to really feel sad about it. I just was like, how do I fix it?"

In addition to discussing the physical aftermath of her overdose in her docuseries, Lovato opened up about the emotional turmoil she experienced from her childhood through today.

"I've had so much to say over the past two years wanting to set the record straight about what it was that happened," Lovato said in the trailer. "I've had a lot of lives. Like my cat, you know? I'm on my ninth life."

Lovato, who was previously engaged to Max Ehrich before breaking it off in September, told Glamour reporter Christopher Rosa she's had a sexual awakening since her overdose and recovery.

Lovato said she realized during her engagement that she was "too queer" to date cisgender men, which prompted her to end the romance.

"This past year I was engaged to a man, and when it didn't work, I was like, 'This is a huge sign.' I thought I was going to spend my life with someone. Now that I wasn't going to, I felt this sense of relief that I could live my truth," she told Glamour.