The only way you can get the Digital Signal & have a good picture is if you buy a TV with built-in QAM tuner, which allows you to connect your in-coming cable(digital) to the back of the TV, without the need for a set-top box.ut your TV has no idea what to do with them. Your TV is analog only-it can display unscrambled analog channels over the raw cable, but that's it. So you need the cable company's box to decode and unscramble the digital signals.
The following can be triggers to a migraine attack and thus can be triggers for the scintillating scotoma or scotomata. 1  Alcohol. 2  Stress. 3  Anxiety. 4  Chemicals such as perfumes.  Smoking or second-hand 1  smoke. Bright lights.  Caffeine 1  withdrawal. Hormonal changes as in the monthly menstrual cycle, or oral contraceptive  usage.
May 1, 2012 By Rebecca Johnson Leave a Comment. A scotoma (Greek for darkness) is an area of diminished or absent retinal sensitivity. It is most commonly referred to in visual field test interpretations. A defect in which no light is seen in the affected area is referred to as an absolute scotoma. If the test shows that the patient cannot view the dimmest light presented during testing, but does respond to brighter lights, the defect is referred to as a relative scotoma. Following are descriptions of common scotoma types based on their location: 1  Central-vision decrease in the center vision.