Sir Elton John says he can’t watch a performance of The Devil Wears Prada:The musicalfor which he wrote texts due to his failing eyesight.

The 77-year-old music icon revealed late last month that he had suffered from a serious eye infection that left him unable to see out of his right eye.

“Unfortunately, I lost my vision in my right eye in July because I had an infection in the south of France,” he continued Good morning America on November 25th. “It’s been four months since I couldn’t see anything. My left eye isn’t the best.”

At a charity gala performance by The Devil Wears Prada: The Musical Speaking for the Elton John AIDS Foundation on Sunday evening, Sir Elton said he had listened to the performance but had not seen it.

“I lost my eyesight and couldn’t see the performance, but I enjoyed listening to it,” he told the BBC.

Sir Elton spoke about his failing eyesight on stage and thanked his husband David Furnish, who he said “was my rock”.

“I wasn’t able to attend many of the previews because, as you know, I lost my eyesight. That’s why it’s hard for me to see it. But I love hearing it, and man, it sounded good tonight,” he said.

Among those in attendance at the event was Anna Wintour, long rumored to be the inspiration behind Miranda Priestly, the steely magazine editor in The devil wears Prada.

“It’s up to the audience and the people I work with to decide if there are any similarities between me and Miranda Priestly,” she said.

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The piece mirrors the film, based on a 2003 novel by Lauren Weisberger, in which aspiring journalist Andy Sachs lands a job at the prestigious runway magazine for “fashion’s most powerful and fearsome icon” Priestly. As Andy struggles to meet her boss’s demands, she finds herself “seduced by the glamorous world that once despised her,” according to promotional material.

Vanessa Williams, by Ugly Betty And Desperate housewives Fame, plays the icy editor Priestly in the stage production.

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Sir Elton said in September that he was slowly recovering from a “serious eye infection” which had caused his vision to be impaired. “Over the summer I struggled with a serious eye infection, which unfortunately meant that I only had limited vision in one eye. I’m recovering, but it’s an extremely slow process and it will take some time before the affected eye can see again,” he said in an Instagram post.

“I am very grateful to the excellent medical and nursing team and my family who have looked after me so well over the last few weeks. I have spent the summer quietly recuperating at home and am positive about the progress I have made so far in my healing and recovery.”