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Characterizing visual processing deficits in cerebral adrenoleukodystrophy.

Camille S Corre1, Melissa Bambery2, Christopher R Bennett3

  • 1Department of Neurology, University of Rochester Medical Center, United States; Department of Neurology, Massachusetts General Hospital, United States.

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|October 13, 2024
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Summary
This summary is machine-generated.

Higher order visual deficits are common in cerebral adrenoleukodystrophy (CALD) even in early stages. Virtual reality testing reveals impaired visual search, highlighting its role in assessing neurological decline.

Keywords:
AdrenoleukodystrophyCerebral visual impairmentVirtual realityVisual processing

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Area of Science:

  • Neurology
  • Ophthalmology
  • Neuroscience

Background:

  • Cerebral adrenoleukodystrophy (CALD) often causes visual impairment, frequently missed or misdiagnosed.
  • Cerebral visual impairment (CVI) categorizes deficits into lower-order (sensory detection) and higher-order (perception, interpretation).
  • Early detection of visual deficits in CALD is crucial for timely intervention.

Purpose of the Study:

  • To describe visual deficits in CALD patients, focusing on higher-order visual function.
  • To assess visual deficits using a virtual reality (VR) interface combined with eye tracking.
  • To evaluate the utility of VR for quantitative assessment of visual perceptual deficits in CALD.

Main Methods:

  • Retrospective review of medical records for visual deficits and MRI lesion burden (Loes score) in CALD patients.
  • Prospective assessment of visual spatial processing using a VR-based task in CALD patients and controls.
  • Comparison of VR task performance between CALD patients and healthy controls.

Main Results:

  • 69% of 89 CALD patients exhibited visual impairment; 56% had lower-order and 59% had higher-order deficits.
  • Visual impairment was present in over half (58%) of patients even in early-stage CALD (Loes score ≤ 3).
  • CALD patients (n=30) showed impaired visual search (lower success, longer reaction time) on VR tasks compared to controls (n=38).

Conclusions:

  • Higher-order visual deficits are prevalent in all CALD stages, extending beyond visual acuity or field impairments.
  • VR-based functional testing provides quantitative assessment of higher-order visual perceptual deficits.
  • VR testing is valuable for evaluating deficits relevant to daily function and may indicate neurological decline in CALD.