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Brain Inj. 2005 Dec;19(13):1125-38.

Elevated dark adaptation thresholds in traumatic brain injury.

Author information

  • 1Department of Vision Sciences, State University of New York/State College of Optometry, New York 10036, USA.

Abstract

PRIMARY OBJECTIVE:

To expand upon earlier findings of elevated dark adaptation (scotopic) thresholds in photosensitive individuals with traumatic brain injury (TBI).

METHODS AND PROCEDURES:

To assess scotopic thresholds in individuals with TBI (n = 17) manifesting varying degrees of photosensitivity (mild, moderate or marked), but without retinal dysfunction, to those of non-photosensitive, visually-normal individuals (n = 21) using a hand-held dark adaptometer.

MAIN OUTCOMES AND RESULTS:

The group mean scotopic threshold for the TBI group was significantly higher than that of the visually-normal group. Over 50% (nine out of 17) of the TBI group exhibited elevated thresholds. There was no correlation between the threshold value and degree of photosensitivity.

CONCLUSION:

The elevated scotopic thresholds suggest an abnormality in cortical gain control. An anomalous adaptive response may develop due to cortical damage, thereby attenuating subjective light sensation.

PMID:
16286326
[PubMed - indexed for MEDLINE]
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