Morphologic characteristics of lamellar channel deposits in the human eye: a case report.

Objective: To report the histologic characteristics of lamellar channel deposits after polymethyl methacrylate intrastromal corneal ring segments in a human eye.

Methods: A 34-year-old man previously diagnosed with keratoconus received photorefractive keratectomy in his left eye that exacerbated his corneal ectasia. To delay or possibly prevent corneal transplant, the patient elected to have intrastromal corneal segments implanted in the left eye.

Histologic evaluation of corneal stroma in rabbits after intrastromal corneal ring implantation.

Purpose: Previous refractive corneal implants have produced histologic changes characteristic of nonspecific lipid keratopathy. Intacs intrastromal corneal ring segments are polymethylmethacrylate (PMMA) corneal inserts approved for the correction of low myopia by the U.S.

Cytotoxic and mutagenic action of 193-nm and 213-nm laser radiation.

Purpose: To compare the cytotoxic and mutagenic effect of 213-nm and 193-nm laser radiation on cultured mammalian cells.

Methods: Chinese hamster lung (V79) cells were exposed to 193-nm radiation from an argon fluorine excimer laser or 213-nm radiation from a 5th harmonic Nd:YAG laser. The cytotoxic action of the lasers was compared by determining the number of V79 cell colonies that formed 1 week after irradiating cells with different doses of 193-nm or 213-nm laser radiation or with continuous wave 254-nm radiation.

Use of bipolar diathermy to prevent posterior capsule opacification(1).

Purpose: To determine the feasibility of using directed bipolar diathermy to eliminate or reduce the formation of new cortical lens material following phacoemulsification in a rabbit model.

Setting: Department of Research & Development, Bausch & Lomb Surgical, and Department of Ophthalmology, St. Louis University, St.