Each eye costs & 20,000 to treat, and the NHS is generally reluctant to pay so much money for an operation some consider experimental.

• 治疗一只眼睛要花2万英镑，英国的公费医疗（国民保健制度）一般不愿意为这种手术花费这么多钱，而且有些人认为这种手术还在试验中。