Herpes viruses, found naturally, are known for inducing equine respiratory, reproductive and neurologic diseases. There are multiple strains of the virus which subsequently cause multiple disease states. It is unsure how or which exact strain is responsible for ocular diseases, but studies seem to indicate the potential for a correlation and have supported the role of EHV-1 in chorioretinitis.
Source: Paulick Report, April 4, 2016.
Although there is sufficient evidence to support the role of EHV-1 in chorioretinitis, the implication of any member of the equine herpesvirus family in corneal disease remains controversial.