Scintillating Scotoma. (Migraine Scotoma). A scotoma is a âblind spotâ in front of the vision. The visual phenomenon of scintillating scotoma usually appears like a âtwinkling shadowâ or âzig zag patternâ before the eyes.While every experience is a little different, the most common symptoms are âblack spotâ or âtwinkling blurâ appearing before the eyes.he visual phenomenon of scintillating scotoma usually appears like a âtwinkling shadowâ or âzig zag patternâ before the eyes. While every experience is a little different, the most common symptoms are âblack spotâ or âtwinkling blurâ appearing before the eyes.
Cancel. Spiders live all over the world, including trees, dry areas, wet areas, under ground and in the oceans. Discover the different varieties of spiders on the earth with information from a science teacher in this free video on spider habitats.ancel. Spiders live all over the world, including trees, dry areas, wet areas, under ground and in the oceans. Discover the different varieties of spiders on the earth with information from a science teacher in this free video on spider habitats.
The overwhelming majority of spiders we encounter in Alaska, even in houses, are native, harmless, and unlikely or unable to bite people, though some of these can be mistaken for widows, recluses, or hobo spiders.o the best of my knowledge, no brown recluses have been found in Alaska, but, like the black widows from Anchorage and Kenai, they could be brought here. This April, multiple Alaskan news outlets reported on a large, living, exotic wandering spider (Ctenidae) that was found in a bunch of bananas in Ketchikan.