The technology described in this briefing is the Boston Keratoprosthesis Type I (Boston KPro I). It is an artificial cornea used to provide a transparent optical pathway into the eye of people with corneal blindness, in whom corneal transplant may not be suitable. The Boston KPro I is available off the shelf and does not need to be specially made for each patient so it can be easily resupplied after corneal graft failure.
The intended place in therapy would be after penetrating keratoplasty has failed, or if it is unlikely to succeed, such as in people with severe corneal opacity with wet blinking eyes.
NICE page: https://www.nice.org.uk/advice/mib91