Phantoms are frail, making them easy to dispatch using weapons. Their immunity to stomps may force the player to use up their charge to get rid of them and limit their maneuverability. Try not to linger around them too much, as they can still target the player if they stand close enough to one.
The "angry eyes" variant behave similarly to an eye, but they move at a fixed speed and do not bounce off walls. Try to eliminate them whenever possible.