An overview of current techniques for ocular toxicity testing
Samantha L Wilson1, Mark Ahearne2, Andrew Hopkinson1
1Academic Ophthalmology, Division of Clinical Neuroscience, University of Nottingham, Queen's Medical Centre Campus NG7 2UH, UK.
Abstract:
Given the hazardous nature of many materials and substances, ocular toxicity testing is required to evaluate the dangers associated with these substances after their exposure to the eye. Historically, animal tests such as the Draize test were exclusively used to determine the level of ocular toxicity by applying a test substance to a live rabbit's eye and evaluating the biological response. In recent years, legislation in many developed countries has been introduced to try to reduce animal testing and promote alternative techniques. These techniques include ex vivo tests on deceased animal tissue, computational models that use algorithms to apply existing data to new chemicals and in vitro assays based on two dimensional (2D) and three dimensional (3D) cell culture models. Here we provide a comprehensive overview of the latest advances in ocular toxicity testing techniques, and discuss the regulatory framework used to evaluate their suitability.
Insights
Ocular toxicity testing evaluates eye exposure dangers. Modern methods, including in vitro and computational models, are replacing traditional animal testing due to ethical and regulatory shifts.
Area of Science:
- Toxicology
- Ophthalmology
- Biotechnology
Background:
- Ocular toxicity testing is crucial for assessing chemical hazards to the eye.
- Historically, the Draize test on rabbits was the standard method.
- Regulatory pressure is driving the adoption of alternative testing strategies.
Purpose of the Study:
- To provide a comprehensive overview of current ocular toxicity testing techniques.
- To discuss advancements beyond traditional animal testing.
- To examine the regulatory landscape for new testing methods.
Main Methods:
- Review of ex vivo tissue tests.
- Analysis of computational toxicology models.
- Evaluation of in vitro assays using 2D and 3D cell cultures.
Main Results:
- Significant advancements in non-animal ocular toxicity testing methods.
- Emergence of validated in vitro and in silico approaches.
- Increased regulatory acceptance of alternative testing strategies.
Conclusions:
- New ocular toxicity testing methods offer viable alternatives to animal use.
- These methods align with global trends to reduce animal testing.
- The regulatory framework is evolving to incorporate these innovative techniques.
