How To Remove An Embedded Tick On A Dog Or A Cat. 1  1. First, you have to locate where the tick is by pushing the fur away from the site. 2  2. Get tweezers or a tick removal tool with thin ends and grip the tick sideways near its head. 3  3. Try to pull it quickly so that the wound will not be infected.
The pupillary light reflex (PLR) is a reflex that controls the diameter of the pupil, in response to the intensity (luminance) of light that falls on the retinal ganglion cells of the eye, thereby assisting in adaptation to various levels of lightness/darkness.he pupillary reflex pathway begins with the photosensitive retinal ganglion cells, which convey information to the optic nerve (via the optic disc). The optic nerve connects to the pretectal nucleus of the upper midbrain, bypassing the lateral geniculate nucleus and the primary visual cortex.
In an afferent pupillary defect there is a decreased direct response caused by decreased visual function in one eye. This can be demonstrated with the swinging flashlight test, in which the light is moved back and forth between the eyes every two to three seconds. The afferent pupillary defect becomes obvious when the flashlight is moved from the normal to the affected eye, and the affected pupil dilates in response to light. Under normal conditions, the pupil constricts in response to light.