There is information about this issue in the archives of this website. Type "icg dye" in the search engine (top center of this page) to locate the thread from kgw1117.
You could also enter "ICG dye toxic to retina" in any of the major search engines (Google, Yahoo, etc.) to locate dozens of professional papers about this topic.
Some doctors use dye and some do not. Toxicity is not a problem is used correctly.
Dr. O.