LASIK corneal marker
Instrument with a marking head of concentric rings or radial blades of asymmetric sizes, coated in ink, used to stamp reference marks on the corneal surface.
How it is used
Applied to the cornea before creating the flap in LASIK refractive surgery: the asymmetric marks allow the flap to be repositioned in its exact original orientation at the end of the procedure, preventing rotation or an inverted replacement that would cause irregular astigmatism.
Clinical tip
Unequal-width marks (e.g., at the 11 and 1 o'clock axes) prevent the flap from being replaced upside down: if the marks don't line up, the orientation is wrong.
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.