Plot hole: At the end of Spectre, Blofeld loses his eye in the crash. In No Time To Die, he is being held in Belmarsh Prison, which is a high-security facility and houses many terrorists like him. However, despite the stringent security measures, he somehow has access to a bionic eye, which was provided to him during his imprisonment. This would have been thoroughly checked multiple times to ensure its safety before being granted to him.
Suggested correction: Blofeld loses the eye in an explosion earlier in Spectre, before he went to London. He likely already had the eye with him when he was captured after the crash.
In the UK there are several TV shows about police and prison corruption. It isn't much of a stretch to imagine that one of the guards was bribed and smuggled the eye in for him. Blofeld is a criminal mastermind - he would have many resources at his disposal despite capture.