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Visual defects in children after cerebral hypoxia
Insights
Perinatal hypoxia/ischemia often causes significant visual deficits in survivors, including tunnel vision. Severity correlates with neonatal seizures, neurological outcome, and gestational age.
Area of Science:
- Neurology
- Ophthalmology
- Pediatrics
Background:
- Perinatal hypoxia/ischemia can lead to severe neurological sequelae in infants.
- Visual function impairments are a known complication, but specific patterns and correlations require further elucidation.
Purpose of the Study:
- To investigate visual function deficits in survivors of perinatal hypoxia/ischemia.
- To identify relationships between visual impairments and factors like gestational age, neonatal seizures, and neurological outcomes.
Main Methods:
- Examination of visual functions in 18 survivors of perinatal hypoxia/ischemia (3 months–17 years).
- Inclusion of two patients with postnatal hypoxic events (8 and 13 years).
- Assessment included visual acuity, visual field size, and optokinetic nystagmus.
Main Results:
- Nearly all patients (16/18) exhibited clear visual deficits.
- Deficits ranged from mild impairments to blindness.
- Five patients presented with tunnel vision, specifically linked to hypoxic/ischemic brain damage.
Conclusions:
- Perinatal hypoxia/ischemia frequently results in significant visual impairments.
- Tunnel vision appears to be a distinct consequence of this type of brain injury.
- Visual defect severity is associated with neonatal seizures, neurological outcome, and gestational age at birth.
Abstract:
Visual functions were examined in 18 survivors of perinatal hypoxia/ischemia with mild to severe neurological sequelae, aged between 3 months and 17 years, and in two patients, aged 8 and 13 years, who had suffered postnatal hypoxic events. All but two patients showed clear visual deficits ranging from mild defects in visual acuity, visual field size, and/or optokinetic nystagmus to blindness. In 5 patients, the visual field was restricted to tunnel vision, a finding which appeared to be specifically related to the hypoxic/ischemic nature of the brain damage. The severity of the visual defects after perinatal hypoxia was related to the occurrence of neonatal seizures, later neurological outcome, and gestational age at birth. This is discussed in relation to previous studies of the effects of perinatal hypoxia/ischemia.