Visual looming syndrome "fear of pointy objects hitting the eye", "weird sensation behind the eyes", "difficulty in focusing on objects nearby, which are moving and are not operated by the observer, such as windscreen wipers or a pencil someone else is holding". In these studies visual looming syndrome is often referred as sharp edges eye syndrome (SEES). "Looming" is a term used in the study of the perception, as it relates directly to psychology. Looming refers to the rapid expansion in the size of any given image. As the image becomes increasingly large on the perceiver's retina, i.e., when an object "looms", there
International Association for the Advancement of Space Safety for both, which may sometimes be confusing. Absolute freedom from harmful conditions is impossible to achieve. To be absolutely safe a system, product, device, material or environment should never cause or have the potential to cause an accident. In the realization and operation of systems the term safety is generally used to mean acceptable risk level, not absolute safety. Acceptable risk level is not the same as personal acceptance of risk, but it refers to risk acceptability by stakeholders’ community or by society in a broad sense. Acceptable risk levels vary from system to system, and evolve with time due