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Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
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Reduced visual acuity is mirrored in low vision imagery.

Aries Arditi1, Gordon Legge2, Christina Granquist2

  • 1Visibility Metrics LLC, Chappaqua, New York, USA.

British Journal of Psychology (London, England : 1953)
|February 5, 2021
PubMed
Summary

Visual imagery in low vision reflects reduced acuity, with objects appearing closer and less detailed. However, the age of vision loss does not impact these mental image characteristics.

Keywords:
low visionvision impairmentvisual acuityvisual cognitionvisual fieldvisual imagery

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Area of Science:

  • Cognitive Neuroscience
  • Ophthalmology
  • Visual Perception

Background:

  • Visual imagery research has primarily focused on sighted and blind individuals, leaving a gap in understanding its nature in those with low vision.
  • Existing research suggests visual imagery engages primary visual brain areas, with limited plasticity in adulthood potentially preserving imagery in late-onset low vision.
  • Conversely, if imagery relies on current visual experience, low vision may alter mental images, mirroring perceptual deficits.

Purpose of the Study:

  • To investigate how low vision affects visual imagery by comparing mental image parameters across normally sighted, early- and late-onset low vision, and restricted visual field groups.
  • To determine if the age of onset or duration of vision impairment influences visual imagery characteristics.

Main Methods:

  • An imagery questionnaire was administered to assess key parameters of mental images.
  • Participants included normally sighted individuals, individuals with early- and late-onset low vision, and individuals with restricted visual fields.

Main Results:

  • Individuals with reduced visual acuity reported imagery distances of objects as closer and depicted objects with lower resolution compared to normally sighted individuals.
  • All low vision groups, similar to the normally sighted, imaged objects at a greater distance than their 'just fits' imagery field (overflow distance).
  • All low vision groups demonstrated a limited visual field for imagery, comparable to normally sighted individuals, with no significant differences observed in the restricted visual field group.

Conclusions:

  • Visual imagery in low vision is influenced by reduced visual acuity, affecting perceived distance and object resolution.
  • Imagery characteristics in low vision are not dependent on the age of onset or the number of years of vision impairment.
  • Despite reduced acuity, visual imagery in low vision shares similarities with normally sighted individuals, including dependence on object size and a limited imagery field.