Britain's Queen Elizabeth, 92, had eye surgery last month

LONDON, June 8 (Reuters) - Britain's Queen Elizabeth, 92, the world's oldest monarch, underwent successful surgery to treat an eye cataract last month, Buckingham Palace said on Friday.

"I can confirm that the queen successfully underwent a short, planned procedure to treat a cataract last month," a palace spokesman said, declining to give further details.

The Press Association news agency said Britain's longest-reigning monarch, who has been on the throne for more than 66 years, underwent the surgery, the most common operation performed in the United Kingdom, at London's private King Edward VII hospital.

She did not have to cancel any official engagements after the treatment, a royal source said, although at some recent events, the queen has been pictured wearing sunglasses.

28 PHOTOS
Queen Elizabeth out and about in 2018
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Queen Elizabeth out and about in 2018
LONDON, ENGLAND - APRIL 19: Queen Elizabeth II greets Canadian Prime Minister Justin Trudeau in a receiving line for the Queen's Dinner for the Commonwealth Heads of Government Meeting (CHOGM) at Buckingham Palace on April 19, 2018 in London, England. (Photo by Matt Dunham - WPA Pool/Getty Images)
LONDON, ENGLAND - APRIL 19: Queen Elizabeth II attends the formal opening of the Commonwealth Heads of Government Meeting (CHOGM) in the ballroom at Buckingham Palace on April 19, 2018, in London, England. (Photo by Yui Mok-WPA Pool/Getty Images)
LONDON, ENGLAND - APRIL 18: Queen Elizabeth II looks on during the unveiling of a panel marking the walkway in Buckingham Palace gardens in relation to the Commonwealth Walkway project on April 18, 2018 in London, England. (Photo by Yui Mok - WPA Pool /Getty Images)
LONDON, ENGLAND - APRIL 18: Queen Elizabeth II looks on during the unveiling of a panel marking the walkway in Buckingham Palace gardens in relation to the Commonwealth Walkway project on April 18, 2018 in London, England. (Photo by Yui Mok - WPA Pool /Getty Images)
WINDSOR, ENGLAND - APRIL 12: Queen Elizabeth II visits the King George VI Day Centre on April 12, 2018 in Windsor, England. The Queen toured the facility and met some of the local residents who use it. (Photo by Samir Hussein/Samir Hussein/WireImage)
WINDSOR, UNITED KINGDOM - APRIL 01: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II attends the traditional Easter Sunday church service at St George's Chapel, Windsor Castle on April 1, 2018 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)
WINDSOR, ENGLAND - APRIL 1: Dean of Windsor, David Conner exits with Queen Elizabeth II followed by Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge after the Easter Mattins Service at St. George's Chapel at Windsor Castle on April 1, 2018 in Windsor, England. (Photo by Tolga Akmen - WPA Pool/Getty Images)
WINDSOR, ENGLAND - MARCH 29: Queen Elizabeth II attends the Royal Maundy Service at St George's Chapel on March 29, 2018 in Windsor, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
Britain's Queen Elizabeth II attends the Royal Maundy Service at St George's Chapel in Windsor, west of London on March 29, 2018. Maundy Thursday is the Christian holy day falling on the Thursday before Easter. The Queen commemorates Maundy by offering 'alms' to senior citizens - retired pensioners recommended by clergy and ministers of all denominations, in recognition of service to the Church and to the local Community. During the Royal Maundy Service on April 2, 2015 the Queen distributed the Maundy money to 89 men and 89 women one for each of the Queen's 89 years. Each recipient receives two purses, one red and one white. / AFP PHOTO / POOL / Steve Parsons (Photo credit should read STEVE PARSONS/AFP/Getty Images)
PLYMOUTH, ENGLAND - MARCH 27: Her Majesty Queen Elizabeth II attends the decommissioning ceremony for HMS Ocean on March 27, 2018 in Plymouth, England. (Photo by Samir Hussein/WireImage)
PLYMOUTH, ENGLAND - MARCH 27: Her Majesty Queen Elizabeth II attends the decommissioning ceremony for HMS Ocean on March 27, 2018 in Plymouth, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - MARCH 20: Queen Elizabeth II visits the Royal Academy of Arts to mark the completion of a major redevelopment of the site on March 20, 2018 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - MARCH 15: Queen Elizabeth II receives the Lieutenant Governor of Prince Edward Island Antoinette Perry during a private audience at Buckingham Palace on March 15, 2018 in London, England. (Photo by Jonathan Brady-WPA Pool/Getty Images)
Britain's Queen Elizabeth II (L) greets South Africa's High Commissioner to the United Kingdom, Nomatemba Tambo during a private audience at Buckingham Palace in central London, on March 14, 2018. / AFP PHOTO / POOL / Jonathan Brady (Photo credit should read JONATHAN BRADY/AFP/Getty Images)
LONDON, UNITED KINGDOM - MARCH 12: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II attends the 2018 Commonwealth Day service at Westminster Abbey on March 12, 2018 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
(L-R) Britain's Queen Elizabeth II, Britain's Prince Charles, Prince of Wales Britain's Prince Harry's fiancee US actress Meghan Markle and Britain's Prince William, Duke of Cambridge, attend a Commonwealth Day Service at Westminster Abbey in central London, on March 12, 2018. Britain's Queen Elizabeth II has been the Head of the Commonwealth throughout her reign. Organised by the Royal Commonwealth Society, the Service is the largest annual inter-faith gathering in the United Kingdom. / AFP PHOTO / POOL / Paul Grover (Photo credit should read PAUL GROVER/AFP/Getty Images)
WINDSOR, ENGLAND - MARCH 8: Queen Elizabeth II and Camilla, Duchess of Cornwall speak to Princess Zahra Aga Khan prior to dinner at Windsor Castle on March 8, 2018 in Windsor, England. Queen Elizabeth II is hosting private dinner in honour of the diamond jubilee of his leadership as Imam of the Shia Ismaili Muslim Community. (Photo by Dominic Lipinski-WPA Pool/Getty Images)
The Queen Elizabeth II and the Aga Khan in the Oak Room at Windsor Castle before she hosts a private dinner in honour of the diamond jubilee of his leadership as Imam of the Shia Ismaili Muslim Community. (Photo by Dominic Lipinski/PA Images via Getty Images)
LONDON, UNITED KINGDOM - MARCH 07: (----EDITORIAL USE ONLY MANDATORY CREDIT - 'BANDAR ALGALOUD / SAUDI KINGDOM COUNCIL / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Crown Prince and Defense Minister of Saudi Arabia Mohammad bin Salman al-Saud (L) meets with Queen Elizabeth II (R) at Buckingham Palace during his official visit in London, United Kingdom on March 07, 2018. (Photo by Bandar Algaloud / Saudi Kingdom Council / Handout/Anadolu Agency/Getty Images)
LONDON, ENGLAND - MARCH 6: Queen Elizabeth II (R) talks with Secretary-General of the International Maritime Organization (IMO) Kitack Lim (L) as she visits the International Maritime Organization (IMO) to mark the 70th anniversary of its formation on March 6, 2018 in London, England. (Photo by Daniel Leal-Olivas - WPA Pool/Getty Images)
LONDON, ENGLAND - FEBRUARY 20: Queen Elizabeth II gives a speech at the Richard Quinn Ready to Wear Fall/Winter 2018-2019 fashion show during London Fashion Week February 2018 on February 20, 2018 in London, England. (Photo by Victor VIRGILE/Gamma-Rapho via Getty Images)
Britain's Queen Elizabeth II, accompanied by British-American journalist and editor, Anna Wintour (3R) and royal dressmaker Angela Kelly, (2R), views British designer Richard Quinn's runway show before presenting him with the inaugural Queen Elizabeth II Award for British Design, during her visit to London Fashion Week's BFC Show Space in central London on February 20, 2018. / AFP PHOTO / POOL / Yui Mok (Photo credit should read YUI MOK/AFP/Getty Images)
Britain's Queen Elizabeth II leaves after visiting the Royal College of Physicians in London on February 20, 2018. Her Majesty visited the Royal College of Physicians of London to mark the 500th anniversary of the body's founding Charter. / AFP PHOTO / POOL / Chris Jackson (Photo credit should read CHRIS JACKSON/AFP/Getty Images)
LONDON, UNITED KINGDOM - FEBRUARY 14: Queen Elizabeth II greets Prime Minister Theresa May at a reception to celebrate the Commonwealth Diaspora community, in the lead up to the Commonwealth Heads of Government meeting in London this April, at Buckingham Palace on February 14, 2018 in London, England. (Photo by Jonathan Brady - Pool/Getty Images)
KING'S LYNN, UNITED KINGDOM - FEBRUARY 07: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II boards a train at King's Lynn Station to return to London after her Christmas break at Sandringham House on February 7, 2018 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)
KING'S LYNN, ENGLAND - FEBRUARY 04: Queen Elizabeth II attends Sunday Service at St Peter and St Paul Church in West Newton on February 4, 2018 in King's Lynn, United Kingdom. (Photo by Mark Cuthbert/UK Press via Getty Images)
CASTLE RISING, ENGLAND - JANUARY 21: Queen Elizabeth II leaves St Lawrence Church on January 21, 2018 in Castle Rising, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
KING'S LYNN, UNITED KINGDOM - JANUARY 07: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 24 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II departs after attending Sunday service at St Mary Magdalene Church, Sandringham on January 7, 2018 in King's Lynn, England. (Photo by Max Mumby/Indigo/Getty Images)
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Earlier on Friday, a smiling Elizabeth appeared without glasses to open the Queen's Diamond Jubilee Galleries at London's Westminster Abbey along with her son and heir Prince Charles.

She is next due to appear in public at Saturday's Trooping the Colour ceremony in central London to celebrate her "official" birthday. Her real birthday is on April 21.

Cataracts are when the lens, a small transparent disc inside your eye, develops cloudy patches. Over time these patches usually become bigger causing blurry, misty vision and eventually blindness.

Despite her age, the queen is known for her robust health and still carries out hundreds of engagements every year.

In 2016, she missed the annual Christmas service she usually attends with her family on her estate in Sandringham, eastern England, due to a heavy cold.

In 2013 she was taken to hospital for treatment for gastroenteritis which forced her to cancel a planned trip to Italy.

21 PHOTOS
Queen Elizabeth loves animals
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Queen Elizabeth loves animals
WINDSOR, UNITED KINGDOM - JULY 20: Queen Elizabeth II smiles as she is shown an orphaned cygnet at Oakley Court on the river bank during a swan upping census on the River Thames on July 20, 2009 near Windsor, England. During the ancient annual ceremony the Swan Marker leads a team of Swan Uppers on a five-day journey along the River Thames from Sunbury-on-Thames through Windsor to Abingdon counting, marking and checking the health of all unmarked swans. (Photo by Sang Tan - WPA Pool/Getty Images)
Britain's Queen Elizabeth II is introduced to 12 week old Labrador puppy 'Flint' by her trainer Ruth Narracott as she tours the facilities during a visit to the headquarters of the charity 'Canine Partners' in Midhurst in West Sussex on November 30, 2017. / AFP PHOTO / POOL / RICHARD POHLE (Photo credit should read RICHARD POHLE/AFP/Getty Images)
Britain's Queen Elizabeth II (2L), meets a horse named Quinn, with a skeleton painted on it to help educate officers, during a visit to the Household Cavalry Mounted Regiment at the Hyde Park Barracks in west London on October 24, 2017. / AFP PHOTO / POOL / Chris Jackson (Photo credit should read CHRIS JACKSON/AFP/Getty Images)
LONDON, UNITED KINGDOM - OCTOBER 19: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II reviews the King's Troop Royal Horse Artillery during their 70th anniversary parade in Hyde Park on October 19, 2017 in London, England. The King's Troop Royal Horse Artillery (KTRHA) was formed by King George VI in October 1947 and are commonly known as the 'Gunners'. (Photo by Max Mumby/Indigo/Getty Images)
STAFFORDSHIRE, UNITED KINGDOM - MAY 25: Queen Elizabeth II visits one of the Duchy of Lancaster Farms where she met tenants John and Victoria Coupland and young Equestrians at the Eland Lodge Equestrian centre on May 25, 2017 in Staffordshire, United Kingdom. (Photo by Richard Stonehouse/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 12: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II with her horse 'Murthwaite Dawn Chorus' which competed in the Fell Class on day 3 of the Royal Windsor Horse Show in Home Park on May 12, 2017 in Windsor, England. (Photo by Max Mumby/Indigo/Getty Images)
DUNSTABLE, UNITED KINGDOM - APRIL 11: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II and Prince Philip, Duke of Edinburgh feed bananas to Donna, a 7 year old Asian Elephant, as they open the new Centre for Elephant Care at ZSL Whipsnade Zoo on April 11, 2017 in Dunstable, England. (Photo by Max Mumby/Indigo/Getty Images)
DUNSTABLE, UNITED KINGDOM - APRIL 11: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II and Prince Philip, Duke of Edinburgh feed bananas to Donna, a 7 year old Asian Elephant, as they open the new Centre for Elephant Care at ZSL Whipsnade Zoo on April 11, 2017 in Dunstable, England. (Photo by Max Mumby/Indigo/Getty Images)
TIDWORTH, UNITED KINGDOM - MARCH 03: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Queen Elizabeth II, in her role as Colonel-In-Chief of The Royal Welsh, attends a review and presentation of leeks to soldiers of The Royal Welsh to mark St David's Day at Lucknow Barracks on March 3, 2017 in Tidworth, England. The Royal Welsh is an Armoured Infantry Battalion of the British Army, formed on St David's Day in 2006, following an amalgamation of The Royal Welch Fusiliers and The Royal Regiment of Wales. (Photo by Max Mumby/Indigo/Getty Images)
ASCOT, ENGLAND - JUNE 18: Queen Elizabeth II with her horse Dartmouth which won The Hardwick Stakes on day 5 of Royal Ascot at Ascot Racecourse on June 18, 2016 in Ascot, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
Britain's Queen Elizabeth visits the Canine Partners charity in Midhurst, Britain, November 30, 2017. REUTERS/Richard Pohle/Pool
An Asiatic lioness looks towards Britain's Queen Elizabeth as she and Prince Philip officially opened the "Land of the Lions" enclosure at London Zoo in London, Britain, March 17, 2016. REUTERS/Toby Melville
Britain's Queen Elizabeth rides her horse in the grounds of Windsor Castle, three days after the death of her mother, in this April 2, 2002 file photo. Queen Elizabeth celebrates her 90th birthday on April 21, 2016. REUTERS/Dan Chung/Files SEARCH 'Queen 90th" FOR ALL IMAGES
Britain's Queen Elizabeth is shown how technology helps animals at The University of Surrey's new School of Veterinary Medicine, as she watches a dog on a treadmill, Guildford, Britain, October 15, 2015. REUTERS/Peter Nicholls
Britain's Queen Elizabeth (L) accompanied by Queensland Premier Anna Bligh looks at two Koalas held by wildlife officers at Southbank in Brisbane October 24, 2011. Queen Elizabeth is in Australia for an 11-day official visit. REUTERS/Mechielsen Lyndon/Pool (AUSTRALIA - Tags: ROYALS POLITICS ENTERTAINMENT ANIMALS)
Britain's Queen Elizabeth laughs as she looks down at a Highland cow during a visit to the Royal Highland Show in Edinburgh, Scotland June 26, 2009. REUTERS/David Moir (BRITAIN SOCIETY ANIMALS ROYALS)
Britain's Queen Elizabeth rubs a Lipizzaner's nose during her visit to Lipica October 22, 2008. Queen Elizabeth and Prince Philip are on a two-day official visit to Slovenia. REUTERS/Srdjan Zvulovic (SLOVENIA)
Britain's Queen Elizabeth II looks on as a mixed breed dog named Gemma is given a cardiogram at the Blue Cross Animal Hospital in London, March 19, 1997. The Queen who is the centenary patron of the Blue Cross, met staff, saw sick animals and watched vets at work in several of the hospital's operating theatres. REUTERS/Shawn Baldwin
Queen Elizabeth II stops to view a group of corgi dogs following her visit to the Alberta Legislature in Edmonton, Alberta May 24, 2005. The Queen spent several minutes talking with owners and petting the animals. REUTERS/Andy Clark AC
Queen Elizabeth II greets the Manitoba Corgi Club as she tours the Forks Market in Winnipeg, Manitoba, October 8, 2002. The Queen is currently on an 11-day Golden Jubilee tour of Canada. REUTERS/Adrian Wyld/ Pool REUTERS SB
Britain's Queen Elizabeth talks to Ken Mansfield and his dog Rocky as she meets prize winning corgis and their handlers in Adelaide February 28, 2002. The Queen arrived in Australia on Wednesday on a five-day visit, and will open the Commonwealth Heads of Government Meeting (CHOGM) in Coolum on March 1. REUTERS/Bob Strong RCS/JD
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(Reporting by Michael Holden; editing by Stephen Addison)

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