Related Experiment Video
Updated: May 7, 2026
The Optokinetic Response as a Quantitative Measure of Visual Acuity in Zebrafish
Published on: October 9, 2013
Early safety assessment of human oculotoxic drugs using the zebrafish visualmotor response
Sudhakar Deeti1, Sean O'Farrell1, Breandán N Kennedy1
1UCD School of Biomolecular and Biomedical Science, UCD Conway Institute, University College Dublin, Belfield, Dublin 4, Ireland.
Introduction:
Many prescribed drugs can adversely affect the eye by causing damage to the function of visual pathways or toxicity to the retina. Zebrafish have the potential to efficiently predict drugs with adverse ocular effects at pre-clinical stages of development. In this study, we explore the potential of using a semi-automated visual behaviour assay to predict drug-induced ocular toxicity in wild-type zebrafish larvae.
Methods:
3 dpf larvae were treated with six known oculotoxic drugs and five control drugs in embryo medium containing 0.1% DMSO. After 48 h, larvae were assessed using the visualmotor response (VMR), an assay which quantifies locomotor responses to light changes; the optokinetic response (OKR), a behavioural assay that quantifies saccadic eye responses to rotating stimuli; and the touch response, a locomotor response to tactile stimuli.
Results:
9 of 10 negative control drugs had no effect on zebrafish visual behaviour. 5 of the 6 known oculotoxic drugs (digoxin, gentamicin, ibuprofen, minoxidil and quinine) showed adverse effects on zebrafish visual behaviour assessed by OKR or the more automated VMR. No gross morphological changes were observed in treated larvae. The general locomotor activity of treated larvae, tested using the touch response assay, showed no differences with respect to controls. Overall the VMR assay had a sensitivity of 83%, a specificity of 100% and a positive predictive value of 100%.
Discussion:
This study confirms the suitability of the VMR assay as an efficient and predictive pre-clinical approach to evaluate adverse ocular effects of drugs on visual function in vivo.
Insights
This study shows that a semi-automated visual behavior assay in zebrafish larvae can effectively predict drug-induced ocular toxicity. The visual motor response (VMR) assay demonstrated high sensitivity and specificity for identifying adverse ocular effects.
Area of Science:
- Ophthalmology
- Toxicology
- Neuroscience
Background:
- Prescription drugs can cause ocular damage, affecting visual pathways and retinal function.
- Zebrafish larvae offer a promising model for pre-clinical prediction of drug-induced ocular toxicity.
- Semi-automated visual behavior assays can enhance the efficiency of these predictions.
Purpose of the Study:
- To evaluate a semi-automated visual behavior assay for predicting drug-induced ocular toxicity in zebrafish.
- To assess the sensitivity and specificity of the visual motor response (VMR) assay in detecting adverse ocular effects.
Main Methods:
- Larvae were exposed to known oculotoxic and control drugs.
- Assessed visual behavior using visual motor response (VMR), optokinetic response (OKR), and touch response assays.
- Quantified locomotor and eye responses to light changes and visual stimuli.
Main Results:
- Five of six known oculotoxic drugs demonstrated adverse effects on zebrafish visual behavior.
- The VMR assay showed high predictive accuracy with 83% sensitivity and 100% specificity.
- No significant morphological changes or general locomotor differences were observed in treated larvae.
Conclusions:
- The visual motor response (VMR) assay is a suitable and predictive pre-clinical method for evaluating drug-induced ocular toxicity.
- This approach efficiently assesses adverse effects on visual function in vivo.
- The VMR assay provides a reliable tool for early-stage drug safety assessment.
