Corneal trephine
A cylindrical instrument with a circular cutting edge, of calibrated diameter, designed to make a precise circular cut through the full thickness of the cornea.
How it is used
Used in penetrating keratoplasty to cut the recipient's and donor's corneal buttons with exactly matching diameters.
Clinical tip
Diameter precision between the donor and recipient buttons is critical to minimize postoperative graft astigmatism.
Sources
This entry is part of the Instriq catalog, researched and written per specialty from real web research -- never generated or invented without verification -- and reviewed skeptically and independently before publication. How this catalog is written.
History
Added to the catalog on 2026-10-05.
Dates derived from the project's public version-control history on GitHub, not a live collaborative edit log.