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Visual advantage in deaf adults linked to retinal changes.

Charlotte Codina1, Olivier Pascalis, Chris Mody

  • 1Academic Unit of Ophthalmology and Orthoptics, University of Sheffield, Sheffield, United Kingdom. C.Codina@Sheffield.ac.uk

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Profound early onset deafness causes neural changes in the retina and optic nerve head, enhancing peripheral vision sensitivity. These retinal adaptations in deaf individuals correlate with improved visual field areas.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Sensory Plasticity

Background:

  • Profound early onset deafness leads to neural reorganizations, particularly auditory-visual cross-modal plasticity.
  • Neural changes in visual processing structures before the visual cortex in deaf individuals remain understudied.

Purpose of the Study:

  • To investigate neural adaptations in the retina and optic nerve head in profoundly deaf adults.
  • To correlate retinal structural changes with peripheral visual field sensitivity in deaf and hearing individuals.

Main Methods:

  • Utilized Optical Coherence Tomography (OCT) to quantify retinal microstructure in 14 deaf and 15 hearing adults.
  • Assessed peripheral visual field sensitivity using Goldmann perimetry in the same participants.

Main Results:

  • Deaf adults exhibited larger optic nerve head neural rim areas, suggesting increased retinal ganglion cell numbers.
  • Deaf adults showed significantly larger visual field areas and distinct retinal nerve fibre layer (RNFL) distribution patterns.
  • Neural rim area and RNFL depth correlated significantly with peripheral visual field sensitivity.

Conclusions:

  • Cross-modal plasticity extends beyond sensory cortices to the retina in early-onset deafness.
  • Specific retinal adaptations in deaf individuals are linked to enhanced peripheral vision sensitivity.