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.
PD (pupillary distance) can be an important part of your lens prescription, and notably affect your general well-being. If you have high myopia, and in particular high myopia and high astigmatism, an incorrect PD value can cause blurry vision, double vision images, headaches, nausea, and fatigue.