How are horses with CSNB diagnosed? Is there a test for it?
At present, the only way to confirm the diagnosis is by an ERG exam. ERG stands for electroretinogram. This test is performed by a veterinary ophthalmologist – a regular veterinarian cannot do it, nor can an ocular exam alone reveal that CSNB is present. This is because the eye structure is normal when examined. In other words, all the parts are there, it is an aspect of the electrical function of the rods that is abnormal. There are veterinary ophthalmologists at locations across Canada, the United States, Europe and other countries around the world. However, we are working very hard to develop a DNA test, so hopefully very soon that option will become available, as it is much less expensive and does not involve transporting the horse, sedation, etc.
Related Questions
- Do all Appaloosas diagnosed with CSNB have the same degree of vision during the day? Is their day vision the same as or different from horses that don’t have CSNB?
- At what level of lighting do horses diagnosed with CSNB experience a change in vision?
- How are horses with CSNB diagnosed? Is there a test for it?
