Color spots in the vision

My husband complains of seeing yellow or reddish spots on his vision when he moves his eyes from side to side.  So if he quickly moves his eyes and then looks at the white wall, he sees yello and at times red spots.  Sometimes he sees them all day, especially the yellow ones but at times he has days his vision is completely normal, he's in his late 20s.  What can it possibly be?  He's been seeing black and clear floaters for a while but the opthalmologist told him his eyes looked great, this was before seeing the yellow and red spots.

[John C Hagan III, MD, FACS, FAAO]

I don't know for sure but it could be an entopic phenomena. In anycase since its new and there is no explanation for it see an Eye MD to make sure there are no retinal problems.

JCH MD