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Parinaud's syndrome is a cluster of abnormalities of eye movement and pupil dysfunction, characterized by: Paralysis of upwards gaze: Downward gaze is usually preserved. This vertical palsy is supranuclear , so doll's head maneuver should elevate the eyes, but eventually all upward gaze mechanisms fail.
Frequently, paralysis of upward gaze along with several ocular findings such as convergence retraction nystagmus and eyelid retraction also known as Collier's sign and Light Near Dissociation (pupil accommodates but doesn't react to light) are known collectively as Parinaud's syndrome [1] or Dorsal Mid-brain syndrome, are the only physical ...
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A third cause of light-near dissociation is Parinaud syndrome, also called dorsal midbrain syndrome. This uncommon syndrome involves vertical gaze palsy associated with pupils that “accommodate but do not react." [5] The causes of Parinaud syndrome include brain tumors (pinealomas), multiple sclerosis and brainstem infarction.
Internuclear ophthalmoplegia (INO) is a disorder of conjugate lateral gaze in which the affected eye shows impairment of adduction.When an attempt is made to gaze contralaterally (relative to the affected eye), the affected eye adducts minimally, if at all.
Accommodative excess may occur secondary to convergence insufficiency also. In convergence insufficiency near point of convergence will recede, and positive fusional vergence (PFV) will reduce. So, the patient uses excessive accommodation to stimulate accommodative convergence to overcome reduced PFV.
This can result in vision changes and Parinaud's syndrome. [3] Due to the aggressive nature of the disease, tumor spread at the time of diagnosis is common. [13] Pineoblastomas often invades locally, with spread to the head and spine seen in 25–41% of patients. [3] While CNS spread is relatively common, these tumors rarely cause distant ...
Homonymous hemianopsia; Paris as seen with left homonymous hemianopsia: Specialty: Ophthalmology : Symptoms: Clumsiness, decreased night visions, difficulty of straight line walking, distorted sight, doubled vision, frequent turning of the head away from the side where it’s present, lack of awareness where it’s present, visual hallucinations