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Related Experiment Video

Updated: May 16, 2026

Effect of Artificial Tear Formulations on the Metabolic Activity of Human Corneal Epithelial Cells after Exposure to Desiccation

Effect of Artificial Tear Formulations on the Metabolic Activity of Human Corneal Epithelial Cells after Exposure to Desiccation

Published on: May 2, 2020

[Morphological alterations induced by preservatives in eye drops].

K K Huber-van der Velden¹, H Thieme, M Eichhorn

¹Augenklinik, Universität Düsseldorf, Moorenstr. 5, 40225, Düsseldorf, Deutschland. klaudia.huber@med.uni-duesseldorf.de

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft

|November 27, 2012

Summary

Chronic use of eye drops with preservatives like benzalkonium chloride (BAC) can harm ocular tissues. Preservative-free formulations are recommended to minimize eye damage and dry eye symptoms.

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Last Updated: May 16, 2026

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Published on: January 10, 2025

Area of Science:

Ophthalmology
Toxicology
Cell Biology

Context:

Ocular surface disease is a common complication of topical eye drop therapy.
Preservatives in eye drops, particularly benzalkonium chloride (BAC), are known to cause ocular tissue damage.
The long-term effects of chronic preservative use on ocular tissues are a significant concern in ophthalmology.

Purpose:

To review the detrimental effects of preservatives in eye drops on ocular tissues.
To highlight the role of benzalkonium chloride (BAC) in causing cytological and histological impairments.
To discuss the potential benefits of preservative-free formulations.

Summary:

Chronic application of eye drops containing preservatives, especially BAC, leads to significant cytological and histological damage in ocular tissues.
Adverse effects include conjunctival inflammation, fibrosis, epithelial cell loss, and corneal changes, often exacerbating dry eye symptoms.
While newer preservatives exist, data on their long-term safety is limited, underscoring the importance of preservative-free options.

Impact:

Preservative-free eye drops represent a safer therapeutic alternative for patients requiring long-term ocular treatment.
Understanding the toxicity of preservatives can guide the development of improved ophthalmic formulations.
Minimizing ocular surface toxicity is crucial for patient compliance and successful management of eye conditions.