![]() ![]() Damaged optic nerve: This nerve carries visual information from the retina to the brain.Seizure: This is an episode of erratic electrical activity in the brain.Transient ischemic attack: Blood flow is temporarily blocked in the brain.Migraine-related flashes: These can occur when the visual cortex of the brain is activated during an attack.Diabetes-related blood in the eye from diabetic retinopathy: The blood leaking from the vessels can cause scarring on the retina, which can pull, resulting in flashes of light and possibly a detachment.Or, a small tear in the retina allows fluid to seep through and collect behind the retina. Emergency physicians routinely test pupillary light reflex to assess brain stem function. When the patient converges on a near target, such as the examiner’s finger, the pupils will constrict (46). ![]() The patient is asked to look at a distant target as the pupils are illuminated from below. It can cause the retina to pull away from the back of the eye. Near response: The pupillary reaction to a near stimulus is clinically relevant when there is a poor light reaction. Scar tissue on the retina pulls on the area, resulting in flashes. Retinal detachment or retinal tear: These can happen if there's fluid leaking behind the retina.It can tug on the light-sensitive retina, causing flashes. Abnormal pupillary light reflex can be found in optic nerve injury, oculomotor nerve damage, brain stem lesions, such as tumors, and medications like barbiturates. It is a benign condition: with time, the. What is normal pupil reaction Normal: Pupils are subtle, mild anisocoria (unequal in size) by itself and not necessarily an abnormal findings. the abnormal pupil to contract vigorously and the normal pupil minimally. Posterior vitreous detachment: This happens when the jelly in the eye begins to shrink as you age. The pupillary reaction to light is normally equal to or greater. ![]()
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