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I cannot find anyting remotely related to this word on Google and I don't have a current surgical equipment book for ophthalmology.
This is on a corneal graft replacement.
It was decided to use an 8.25-mm [s/l hespar] bearing trephine to trephinate the host cornea and then oversize the donor cornea by 0.5 and use an 8.75-mm bearing trephine