Ingress of India Ink Into the Anterior Chamber Through Sutureless Clear Corneal Cataract Wounds

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Abstract
Background Sutureless clear corneal cataract incisions may be associated with an increased risk of endophthalmitis. Objective To assess the degree of ocular surface fluid ingress into the anterior chamber of cadaveric human globes with clear corneal wounds. Methods Self-sealing clear corneal incisions were created in 4 eyes, and intraocular pressure was controlled with an infusion cannula. To evaluate possible flow of surface fluid through the corneal wound, india ink was applied to the corneal surface while the intraocular pressure was varied, so as to simulate the intraocular pressure fluctuations secondary to blinking or eye squeezing. The optical density from aqueous samples of globes were measured both before and after india ink application using a spectrophotometer. Results Aqueous aspirates from the 3 globes with sutureless clear corneal wounds revealed a significant increase in spectrophotometric readings (P<.01), in contrast to the sutured wound, which did not show an increase in absorbance level relative to the baseline. Ink particles were both grossly and microscopically visible inside the sutureless corneal wounds. Conclusions Fluctuations of intraocular pressure following sutureless clear corneal cataract surgery may allow entry of surface fluid into the anterior chamber during the initial postoperative period when the wound is not healed.

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