THE FULL ARTICLE — from the International Standard Bible Encyclopedia

The International Standard Bible Encyclopedia (1915), general editor James Orr — public domain, printed whole.

i'-sav (kollourion; collyrium; Re 3:18):

A Phrygian powder mentioned by Galen, for which the medical school of Laodicea seems to have been famous (see Ramsay, The Letters to the Seven Churches of Asia), but the figurative reference is to the restoring of spiritual vision.