Instead of taking it easy post-surgery however, the Queen carried on with her demanding schedule and didn't cancel a single engagement.
She also toured the Diamond Jubilee Galleries at Westminster Abbey with Prince Charles.
In April, the husband of Elizabeth II - Duke of Edinburgh Philip - had surgery on the hip joint. However if you look at recent photographs, you'll notice that she's been wearing sunglasses in quite a few of them. And he was well enough to attend - unaided - the May 19 wedding of his grandson Prince Harry to the American actress, the former Meghan Markle.
Besides, Britain is not known for brilliant sunshine. It's an increasingly common procedure aimed at helping people suffering from the exasperating blurry vision that often comes with old age, or even middle age.
The Press Association learned from a source that the Queen was treated as a day patient at the private King Edward VII's hospital in London.
Cataracts are when the lens, a small transparent disc inside your eye, develops cloudy patches.
Cataract surgery typically takes just 30 to 45 minutes under local anaesthetic, but it can take an individual four to six weeks to fully recover.
In 2013 she had her first hospital stay in 10 years when she had symptoms of gastroenteritis.