I believe the TV show Myth Busters has indicated one of their future projects is to show the lights dim policy and the window blinds up for landing policy are myths in that night adaption to any effective degree is impossible in an airliner cabin and in fact could be potentially lethal to passengers who are vision impaired (elderly and those wearing glasses) whose vision is infinately reduced further in a dim light cabin environment. In fact if there is a fire outside the aircraft after an accident, you could argue that window blinds down could delay onset of night vision destruction - if there was any in the first place.