Alternative methods for the replacement of eye irritation testing.

Area of Science:

• Toxicology
• Ophthalmology
• Regulatory Science

Background:

• The traditional in vivo Draize eye test faces criticism for ethical concerns, cost, and limited predictivity.
• Regulatory bodies are actively seeking alternatives to animal testing for assessing eye irritation potential of consumer products.

Purpose of the Study:

• To review the progress and current status of animal-free test methods for eye irritation assessment.
• To discuss the limitations and regulatory acceptance of various alternative methods.
• To highlight emerging full-thickness cornea models for predicting GHS eye irritation categories.

Main Methods:

• Review of ex vivo and in vitro methods for eye irritation testing.
• Discussion based on corneal anatomy and mechanisms of irritation.
• Evaluation of established and novel alternative models.

Main Results:

• Several animal-free methods have been developed to categorize substances for eye irritation according to the Global Harmonized System (GHS).
• Established in vitro models and emerging full-thickness cornea models show promise.
• The review discusses the limitations and regulatory acceptance status of these alternative methods.

Conclusions:

• Significant progress has been made in developing alternative methods to animal testing for eye irritation.
• Emerging full-thickness cornea models offer potential for predicting all GHS eye irritation categories.
• These advancements are crucial for ethical and scientifically robust consumer product safety assessment.