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.
The scotoma is caused by constriction of the blood flow to your retina. If the scotoma is close to or covers the center of your vision it is more serious. Treatment can be as simple as an adult low strength Aspirin to anti migraine drugs.