This is long overdue, since the Ishihara is pretty useless unless it’s done under exactly the same conditions every time, and if I’m understanding the FAA response to Avweb correctly, dropping the requirement for a new color vision test every time is also significant progress, since color vision usually doesn’t change appreciably, so the old/current requirements are wasting a lot of time and probably generating more than a few false positives if the Ishihara was used incorrectly.