Related Experiment Videos
Analysis of alternative methods for determining ocular irritation
T Märtins1, J Pauluhn, L Machemer
1Bayer AG, Department of Toxicology, Wuppertal, Germany.
Summary
The bovine eye-chicken egg chorioallantoic membrane (BE-CAM) assay shows limited predictive power for eye irritation compared to traditional methods. Ultrasonic pachymetry offers a more sensitive alternative for assessing corneal changes.
Area of Science:
- Toxicology
- Ophthalmology
- In vitro testing
Background:
- Chemicals, dyes, agrochemicals, and pharmaceuticals require eye irritancy/corrosion evaluation for regulatory compliance.
- The conventional Draize method, while established, involves animal testing.
- Alternative methods are sought to improve accuracy and reduce animal use in safety assessments.
Purpose of the Study:
- To assess the predictive accuracy of the bovine eye-chicken egg chorioallantoic membrane (BE-CAM) assay.
- To compare BE-CAM assay results with the conventional Draize method for eye irritancy.
- To evaluate ultrasonic pachymetry as a potential alternative for assessing corneal effects.
Main Methods:
- In vitro testing using the BE-CAM assay.
- Comparison with in vivo results from the conventional Draize method.
- Pilot study utilizing ultrasonic pachymetry to measure corneal thickness.
Main Results:
- The BE-CAM assay demonstrated limited correlation between in vitro reactions and in vivo eye responses.
- A fairly good correlation was observed between corneal thickness measurements from ultrasonic pachymetry and clinical observations.
- Ultrasonic pachymetry exhibited high sensitivity in detecting corneal changes.
Conclusions:
- The BE-CAM assay has limited predictive value for eye irritancy and corrosion assessments.
- Ultrasonic pachymetry shows promise as a sensitive and reliable method for evaluating corneal effects in eye irritation studies.
- Further validation of ultrasonic pachymetry may support its use as an alternative to traditional methods.