It is much more noticeable when viewed against a field of pure blue light and is caused by white blood cells moving in the capillaries in front of the retina. White cells are larger than red blood cells and can be larger than the diameter of a capillary, so must deform to fit. As a large, deformed white blood cell goes through a capillary, a space opens up in front of it and red blood cells pile up behind. This makes the dots of light appear slightly elongated with dark tails. [4][5]
Haidingers brush is a very subtle bowtie or hourglass shaped pattern that is seen when viewing a field with a component of blue light that is plane or circularly polarized. Its easier to see if the polarisation is rotating with respect to the observers eye, although some observers can see it in the natural polarisation of sky light. If the light is all blue, it will appear as a dark shadow; if the light is full spectrum, it will appear yellow. It is due to the preferential absorption of blue polarized light by pigment molecules in the fovea. [6][7]
Purkinje images are the reflections from the anterior and posterior surfaces of the cornea and the anterior and posterior surfaces of the lens.
You will have continuously ECG monitoring during the infusion and 4 hours after your infusion. Some of the minor side effects are headache and irregular heartbeat. If you experience chest pain and respiratory difficulties, you should report to your doctors immediately. See also
Sematilide
Risotilide


== References ==