Citologia de impressão da superfície ocular: técnica de exame e de coloração

Abstract

Purpose: To present an examination technique and to standardize the staining procedure of samples of impression cytology of the ocular surface in a reference service. Methods: 28 samples of impression cytology were obtained from patients with ocular surfaces alterations of the External Eye Diseases Sector in the period of July to November 1999. They were stained and microscopically evaluated in the Ocular Microbiology Laboratory of the Federal University of São Paulo. Results: We developed a design of a filter paper with apex, base and lateral opening that promoted its adequate position both in the eye at collection and on the glass microscope slides for fixing and staining procedures. The staining technique that uses periodic acid-Schiff, hematoxilin and Papanicolaou is an easy and economic procedure which stains goblet and epithelial cells. Conclusions: The modified method for staining showed to be ideal for the cytologic evaluation of samples of the impression cytology examination. Impression cytology is a very reliable method to study ocular surface, and has proved to be really simple, a cheaper and more confortable procedure for the patient than invasive biopsies.