Castroviejo caliper
A precision caliper with two sharp points and a built-in millimeter scale, adjustable via a fine thumbscrew.
How it is used
Used in ophthalmic and corneal surgery to precisely measure distances, such as corneal diameter or graft size in a keratoplasty.
Clinical tip
The fine adjustment screw allows the exact opening to be locked before transferring the measurement to tissue, avoiding parallax errors.
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.