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LONDON, UNITED KINGDOM - MARCH 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex sits in the cockpit of the Orbis Flying Eye Hospital at Stansted Airport on March 20, 2017 in London, England. Eye charity Orbis's new Flying Eye Hospital (a converted MD-10 cargo freighter) is equipped with an onboard operating theatre to perform eye surgery to treat avoidable blindness in Africa, Asia and Latin America. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - MARCH 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex sits in the cockpit of the Orbis Flying Eye Hospital at Stansted Airport on March 20, 2017 in London, England. Eye charity Orbis's new Flying Eye Hospital (a converted MD-10 cargo freighter) is equipped with an onboard operating theatre to perform eye surgery to treat avoidable blindness in Africa, Asia and Latin America. (Photo by Max Mumby/Indigo/Getty Images)
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LONDON, UNITED KINGDOM - MARCH 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex tours the Orbis Flying Eye Hospital at Stansted Airport on March 20, 2017 in London, England. Eye charity Orbis's new Flying Eye Hospital (a converted MD-10 cargo freighter) is equipped with an onboard operating theatre to perform eye surgery to treat avoidable blindness in Africa, Asia and Latin America. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - MARCH 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex tours the Orbis Flying Eye Hospital at Stansted Airport on March 20, 2017 in London, England. Eye charity Orbis's new Flying Eye Hospital (a converted MD-10 cargo freighter) is equipped with an onboard operating theatre to perform eye surgery to treat avoidable blindness in Africa, Asia and Latin America. (Photo by Max Mumby/Indigo/Getty Images)
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LONDON, UNITED KINGDOM - MARCH 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex wears a pair of 3D glasses as she tours the Orbis Flying Eye Hospital at Stansted Airport on March 20, 2017 in London, England. Eye charity Orbis's new Flying Eye Hospital (a converted MD-10 cargo freighter) is equipped with an onboard operating theatre to perform eye surgery to treat avoidable blindness in Africa, Asia and Latin America. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - MARCH 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex wears a pair of 3D glasses as she tours the Orbis Flying Eye Hospital at Stansted Airport on March 20, 2017 in London, England. Eye charity Orbis's new Flying Eye Hospital (a converted MD-10 cargo freighter) is equipped with an onboard operating theatre to perform eye surgery to treat avoidable blindness in Africa, Asia and Latin America. (Photo by Max Mumby/Indigo/Getty Images)
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LONDON, UNITED KINGDOM - MARCH 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex disembarks an AgustaWestland AW109 helicopter (part of The Queen's Helicopter Flight) as she visits the Orbis Flying Eye Hospital at Stansted Airport on March 20, 2017 in London, England. Eye charity Orbis's new Flying Eye Hospital (a converted MD-10 cargo freighter) is equipped with an onboard operating theatre to perform eye surgery to treat avoidable blindness in Africa, Asia and Latin America. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - MARCH 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex disembarks an AgustaWestland AW109 helicopter (part of The Queen's Helicopter Flight) as she visits the Orbis Flying Eye Hospital at Stansted Airport on March 20, 2017 in London, England. Eye charity Orbis's new Flying Eye Hospital (a converted MD-10 cargo freighter) is equipped with an onboard operating theatre to perform eye surgery to treat avoidable blindness in Africa, Asia and Latin America. (Photo by Max Mumby/Indigo/Getty Images)
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Getty Images Entertainment Max Mumby/Indigo

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LONDON, UNITED KINGDOM - MARCH 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex visits the Orbis Flying Eye Hospital at Stansted Airport on March 20, 2017 in London, England. Eye charity Orbis's new Flying Eye Hospital (a converted MD-10 cargo freighter) is equipped with an onboard operating theatre to perform eye surgery to treat avoidable blindness in Africa, Asia and Latin America. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - MARCH 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Sophie, Countess of Wessex visits the Orbis Flying Eye Hospital at Stansted Airport on March 20, 2017 in London, England. Eye charity Orbis's new Flying Eye Hospital (a converted MD-10 cargo freighter) is equipped with an onboard operating theatre to perform eye surgery to treat avoidable blindness in Africa, Asia and Latin America. (Photo by Max Mumby/Indigo/Getty Images)
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Getty Images Entertainment Max Mumby/Indigo