Why do donors tick the opt-out box for eyes?
Of the hundreds of thousands of organ donors who may have had their wishes wrongly recorded, many chose not to donate their eyes. Why are some people so reluctant to give them up in death?
While many of Britain's 17 million registered body part donors give consent for all their organs and tissues to be used for transplant after their death, more than 10% have chosen to with-hold consent for certain parts - by far the most common being eyes.
Historically, they have held cultural and spiritual significance. Referred to as "windows to the soul" by Roman philosopher Cicero, the eye is also often regarded as symbolising knowledge. In Hinduism and Buddhism, the third eye is a symbol of enlightenment.