Expanded uncertainty. quantity defining an interval about the result of a measurement that may be expected to encompass a large fraction of the distribution of values that could reasonably be attributed to the measurand.
Introduction. 'Phantosmia' is the medical term for an imaginary odour (phantom smell) . It is also known as an olfactory hallucination. The smell is unique to the person and is usually unpleasant, spoiling the taste of any food or drink consumed.It can be in one or both nostrils.ess commonly, the cause of phantosmia is either nerve cells sending abnormal smell signals to the brain, or a problem with the brain itself. This may be the result of: 1  a disease affecting the nervous system, such as epilepsy, Parkinsonâs disease or Alzheimerâs disease. 2  a stroke.
astigmatism is a common eye condition marked by an irregular curvature of the cornea this type of condition is also known as a refractive error and occurs in nearly everyone to some degree if the cornea is significantly curved the condition must be treatedowever the eye of a person with astigmatism is shaped more like a football or the back of a spoon for this person when light enters the eye it is refracted more in one direction than the other allowing only part of the object to be in focus at one time objects at any distance can appear blurry and wavy