Nerve paralysis sends the pupil to expand may also send the pupil to expand, the benadryl poison chlorine Imitates has lulled the depth and so on wholesale sunglasses, pupil sometimes shrinks sometimes disperses is called the pupil to shake or the iris unstably. The cerebrospinal fluid pressure advances situation like later period suppurative meningitis brain. Extends shrinks the phenomenon. In healthy persons blue The year may have the dependent pupil shake to belong to the normal physiological common pupil inspection not to be easy to discover that must use the pupil mirror inspection only then to see the year, dropsy brain tumor and the newborn encephalic hemorrhage and so on may cause the pupil Expands the insane yong outbreak. Pupil's innervation: Pupil's size and the response the nerve and the sympathetic nerve control, this two kind of nerve intercoordination, the interaction, control pupil's change. The sympathetic nerve controls pupil's sympathetic nerve to stem from the mesencephalonⅢTo skull god After miosis nucleus, also calls - the Wei nucleus. This nucleus located at mesencephalon water conduit ventralis oculomotor nerve nucleus's front end, about each one, constitutes by the small cell group, henceforth issues after due investigation the sympathetic nerve textile fiber follows the oculomotor nerve to walk the line, from crus cerebri oculomotor nerve ditch Leaves the brain, after the cerebrum on the artery and the cerebellum between the artery passes by the backdrop hiatus to enter the cranial fossa forward to put on the sinus cavernosus, enters after the fissura orbitalis superior kuang, enters the eyelash shape ganglion exchange neuron along under musculus obliquus nerve fiber, passes through the eyelash shape to be listless again after the control pupil sphincter and the eyelash shape muscle, Manages pupil's contraction and the pupil control action. The sympathetic innervation pupil's nerve stems from the widespread cerebral cortex, when after stimulation temporal lobe central committee, when returned or nie other day, all might cause the two-sided mydriasis. Sends out the textile fiber from the above spot after in pouch to the hypothalamus Funnel's flank, is the second level of mydriasis main center, also from this sends out the textile fiber after the mesencephalon, the pons median line place to enter the medulla oblongata network structure, downward to spinal cord eyelash shape main center, this main center located at the C8-T1 side angle cell, from this main center sends out the textile fiber to do to the nerve, After the neck under the ganglion, the neck the ganglion to the neck on the ganglion oakley sunglasses exchange neuron, after henceforth the ganglion sends out the festival, the textile fiber joins in the neck the artery clump, the artery hole enters the cranial cavity after the neck, along trigeminal or trifacial nerve eye, enters after the fissura orbitalis superior kuang to the eyelash shape ganglion, again by nose eyelash nerve sum Eyelash shape long innervation in mydriasis myo-, on jian smooth muscle jian board muscle and eye socket smooth muscle, causes the mydriasis. Second, the common pupil normal response needs to understand that the pupil exceptionally must understand pupil's normal response first. The common pupil normal response has the following several kinds: Pupil Light reflection: The optical fiber illumination pleasant or the optical fiber intensity strengthens suddenly, the pupil reduces immediately; The candle-power is weaken or removes, the pupil immediately disperses in a big way, this kind of pupil calls the pupillary reflex to the optical fiber strong and the weak change's response, on clinical divides into it the direct light reflection and Meets the light reflection. The optical fiber shines one, is shone the eye pupil to reduce immediately, called that it the direct light reflection, at the same time, the opposite side has not been shone the eye pupil also to reduce, the latter is called the pupil indirect light reflection. Pupil set reflection: Both eyes gaze at the far goal, then When immediately gazes at present the short distance object, the pupil reduces immediately, gazes at first is near at present the goal, when then gazes at the distant place, the pupil disperses immediately in a big way, this kind of pupil the change which far and near occurs along with the gaze goal, is called the pupil set to respond, either calls pupil's near response or The adjustment responded. The pupil set reflection has two kinds: Optional pupil set reflection which controls by the will, like when gaze tip of the nose binocular set, pupil contraction; Reflective, if gazes at a motion the goal gradually from far to near or from near to far time causes pupillary reaction . The pupil shuts jian the reflection: When eyelid closed, the pupil reduces; Or when separates the eyelid forcefully with the hand when the cheap sunglasses patient attempts the effort closes one's eyes, the pupil also presents the contraction, this kind of pupillary reflex called that it shuts jian the reflection the pupil or calls the eye wheel myo- reflection.