None of these new petroleum products are true distillates, they are extracts and creations of the petroleum engineers gluing bits and pieces of hydrocarbon molecules from the refinery waste stream together to make useful, salable products.
The Causes of Double Vision. Double vision, or diplopia, occurs when your eyes donât work as a team. When your visual system is working correctly, both eyes should point in the same direction at an object. Your eyes see two different images, which your brain combines to produce a single, 3D image.
1 You have a refractive error such as long-sightedness or astigmatism. During the day, you may be able to compensate for these, but when your eyes are tired, your vision can go blurry.  You could be mildly short-sighted. This may not bother you in normal light, but you notice it at lower light levels.