I have been on bright light therapy for a week now for Delayed Sleep Phase Syndrome. It is working. My problem is that my vision is getting blurry and whenever I look at anything bright now that visual image of what I looked at sticks in my eyes and I can even close my eyes and look away and the imprint is still there(that fades after like 30 minutes). The light I am using is a 10,000 lux light I got off amazon. Anyways, I still need to continue maintenance, and I am hoping that the blurriness is just a temporary side effect. Does anyone have any information about that? Thanks, Brian