A video of popstar Katy Perry's eye malfunctioning on stage during one of her performances at the Las Vegas Resorts World show recently went viral. In the video, the Fireworks singer can be seen blinking with just one eye, while the other one remains closed. She attempts to fix it by touching her cheek until she can open both eyes properly.However, she wastes no time and quickly deflects by picking up her microphone to say, "Make even more noise for my band."Her residency show at the Las Vegas Resorts World, titled Play, is themed around her playing a doll who lives in a giant toy box. Perry was seen wearing a silver dress made out of crushed soda cans for the effect.Netizens speculate about Katy Perry's eyeThe 38-year-old musician left netizens shocked, and they tried to think of the possible cause. Many speculated that it was a side-effect of the COVID-19 vaccine administered early last year.Perry has been a big advocate for the vaccine, even going to the extent of dressing up as an injection last Halloween to promote it alongside her partner Orlando Bloom, who was dressed as a doctor. View this post on Instagram Instagram PostSome fans debased the vaccine side-effect rumors claiming that the strange malfunction could have been due to botox, which is a cosmetic treatment that removes wrinkles from the face by temporarily paralyzing facial muscles. Droopy eye syndrome is reportedly a common effect after receiving the botox treatment. While some fans expressed their concern for Perry, most people could not help tweeting about their theories. One user called her a doll whose eye would get stuck if its head was tilted backwards - a fitting description considering the theme of Katy Perry's shows.Citizen Free Press@CitizenFreePresPeople are freaking out over this Katy Perry clip.It's not from the Vaccine.It's Botox.Botox often leads to droopy eye syndrome.27055People are freaking out over this Katy Perry clip.It's not from the Vaccine.It's Botox.Botox often leads to droopy eye syndrome.https://t.co/OUsy6xMhOZJanice@jannyfayray@CitizenFreePres @TonyBrunoShow I’ve had Botox, this has never happened to me or anyone else I know who has had Botox.151@CitizenFreePres @TonyBrunoShow I’ve had Botox, this has never happened to me or anyone else I know who has had Botox.SpinGirl 🇺🇸🇺🇸@kim34009675@CitizenFreePres No it’s not Botox. It’s the shot .66@CitizenFreePres No it’s not Botox. It’s the shot .Petra@VintageMom17@CitizenFreePres I thought eyelash glue.@CitizenFreePres I thought eyelash glue.Lelia@_leliak@CitizenFreePres It’s like she has a button in her temple lol@CitizenFreePres It’s like she has a button in her temple lolA-ARON messed up!!@Messedup_A_aron@CitizenFreePres Haha looks like those giant fake eyelashes are locking together like the tumblers in a bank vault.4@CitizenFreePres Haha looks like those giant fake eyelashes are locking together like the tumblers in a bank vault.JohnnyA@jfaraiza1956@CitizenFreePres Katy is a living doll.@CitizenFreePres Katy is a living doll.While theories abound, the "faulty" eye could just be a routine Perry is using for her performances, considering that she is known for her wacky costumes and out-of-the-box themes. This "glitch" seems right up her street.This is not the first time that netizens are debating about the side effects of the vaccine in relation to a celebrity. Earlier this year, pop star Justin Bieber shared that he was suffering from Ramsay Hunt syndrome, which had rendered his face partially paralyzed. Several netizens speculated at the time that the cause of his condition was the shot.Katy Perry is yet to address the eye "glitch" at the time of writing.