Slit knives, or keratome blades, are ultra-sharp, precision ophthalmic surgical tools used to create clean, self-sealing corneal incisions for cataract and other eye surgeries, allowing for insertion of intraocular lenses or phaco tips, featuring single or double bevels, varying widths (e.g., 1.0-3.2mm), and often anti-glare finishes for improved visibility, ensuring minimal tissue trauma and better wound healing.