The standard pupil size ranges between 2 millimeters (mm) and 8 mm, depending on the lighting. It controls how much light enters the eye before it reaches the retina.

In this case, mydriasis was considered to result from phenylephrine/lidocaine spray which was used to provide topical anaesthesia to the airway. A pupil is the round black circle in the center of the iris.

Luckily, the patients mydriasis and lack of pupillary reactivity spontaneously. While 80 percent of Adie tonic pupils are unilateral, bilateral involvement typically has an incidence of 4 percent per year. Unilateral mydriasis can be an ophthalmologic emergency. The fixed dilated pupil: Sudden iridoplegia or mydriatic drops A simple diagnostic test. Adie tonic pupil has a prevalence of population and occurs in a 2.6:1 female to male ratio with an average age of onset of 32 years (Thompson, 590). It controls how much light enters the eye before it reaches the retina. Episodic unilateral mydriasis in otherwise normal patients. Unilateral mydriasis, while unusual, may be seen during general anaesthesia and requires thorough knowledge of autonomic nerve pathways and pharmacology of the eye for correct diagnosis. A pupil is the round black circle in the center of the iris. Consideration of these factors, the autonomic innervation of the eye, and an intraoperative 'wake-up' test allowed satisfactory neurological assessment in this patient and surgery to proceed. The possible aetiology of the unilateral mydriasis includes the effects of anaesthetic agents, stellate ganglion block, impaired venous return from the head and neck, acute intracranial mass lesion or an haemorrhagic event, direct eye trauma, pre-existing medical or surgical conditions, and inadvertent direct deposition of alpha-adrenergic or anticholinergic agents in the eye. The objectives of this study were to determine the underlying condition responsible, the natural history of recovery of third nerve palsy and the ultimate clinical outcome in 60 patients admitted to a regional neurosurgical centre with a diagnosis of TBI and unilateral or bilateral fixed, dilated pupils (FDP). I report finding a dilated right pupil (7 mm, nonreactive to light) after bronchoscopic tracheal intubation and induction of general anaesthesia in a frail, 74-yr-old woman with cervical subluxations and spinal cord impingement. In addition, the assessment of abnormal neurological findings is limited during general anaesthesia, and therefore requires special consideration. Unilateral mydriasis is a disturbing finding during anaesthesia and may indicate serious neurological injury.

Unilateral blown pupil