ok i asked the lamp halo question a while ago and i got a pretty insatisfactory response. i cant find the original post, but i have a theory as to why it happens. and just to clarify the original question was why is it that when you look at a street lamp from far away you see like a halo ish thing around it. my reason is like this: your eye is essentially a circular 'hole' and you look through it, so there is diffraction. and the diffracted thiny looks (in 2d) like a blob of light with rings around it that are really dim. so maybe you see the lamps like ring thingies around it? sorry if my terminology is terrible any thoughts?