Optimization of Optomotor Response-based Visual Function Assessment in Mice.

Area of Science:

• Neuroscience
• Ophthalmology
• Pharmacology

Background:

• Optomotor response (OMR) assays are crucial for studying visual function and developing drugs for eye and brain disorders.
• Current OMR methods in mice are often time-consuming and prone to bias, hindering efficient assessment.
• There is a need for improved OMR techniques for accurate and rapid vision evaluation in preclinical research.

Purpose of the Study:

• To develop an optimized, sensitive, and unbiased protocol for assessing visual acuity and contrast sensitivity in mice using OMR.
• To introduce a novel indicator of OMR absence based on mouse head pausing behavior.
• To validate the efficacy of the new protocol in wild-type and genetically modified mouse models.

Main Methods:

• An optimized staircase protocol was designed, utilizing mouse head pausing as a primary indicator for the absence of OMR.
• The protocol was implemented in an OMR system, allowing for automated or manual assessment of visual performance.
• Validation was performed on wild-type mice and a mouse model with rhodopsin deficiency-induced retinal degeneration.

Main Results:

• The developed protocol demonstrated high sensitivity and reliability in assessing visual function.
• The OMR system successfully detected progressive visual decline in rhodopsin-deficient mice, correlating with photoreceptor loss.
• The head pausing indicator provided rapid and unambiguous vision assessment, reducing procedural bias.

Conclusions:

• The optimized OMR protocol offers a significant advancement over existing methods for vision assessment in mice.
• This technique provides a sensitive, accurate, and efficient tool for phenotypic studies and drug discovery in visual neuroscience.
• The protocol facilitates quick and unbiased evaluation of visual acuity and contrast sensitivity, crucial for understanding and treating vision impairments.