In one form of gene therapy to treat loss of sight, a virus containing genetic material injected in one eye has now been shown to travel into the untreated eye
Source:
https://www.newscientist.com/article/2262327-gene-therapy-injected-in-one-eye-can-travel-to-the-other-eye/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home