Several "eye" witnesses have told me that they saw eyes at very close range that seemed to intentionally get brighter & change color. One of them gave a disturbing description of them from a face to face night time encounter. I have seen bright lights coming from an area where they were, but because of the distance, can't say for sure that it was their eyes.
When I saw the dim glowing eyes, they were hiding & watching, & the glow didn't seem intentional or being used for light. It kind of reminds me of a smouldering fire.