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Correlation Between Structural and Functional Retinal Changes in Parkinson Disease.

Manpreet Kaur1, Rohit Saxena, Digvijay Singh

  • 1Squint and Neuro-Ophthalmology Section, Dr. Rajendra Prasad Centre for Ophthalmic Sciences (MK, RS, DS, PS, VM), All India Institute of Medical Sciences, New Delhi, India; and Department of Neurology (MB), Neurosciences Centre, All India Institute of Medical Sciences, New Delhi, India.

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Summary
This summary is machine-generated.

Parkinson disease (PD) patients show subclinical vision loss and retinal thinning, particularly in the ganglion cell layer. These structural changes correlate with visual function, suggesting GCL-IPL thickness is a key indicator.

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Area of Science:

  • Ophthalmology
  • Neurology
  • Neuroscience

Background:

  • Parkinson disease (PD) is a neurodegenerative disorder affecting motor function.
  • Retinal structural changes and their correlation with visual function in PD are not fully understood.

Purpose of the Study:

  • To evaluate retinal structural changes in Parkinson disease patients.
  • To correlate these structural alterations with visual function measurements.

Main Methods:

  • A cross-sectional study compared 20 PD patients with 20 healthy controls.
  • Visual functions (acuity, color, contrast, fields, VER, mfERG) and retinal structures (RNFL, macular, GCL-IPL thickness via SD-OCT) were assessed.

Main Results:

  • PD patients exhibited worse contrast sensitivity and reduced foveal electrical activity.
  • Significant thinning was observed in retinal nerve fiber layer (RNFL) and ganglion cell-inner plexiform layer complex (GCL-IPL).
  • Functional deficits correlated with structural changes, disease duration, and severity.

Conclusions:

  • Subclinical visual dysfunction is present in Parkinson disease patients.
  • Ganglion cell-inner plexiform layer (GCL-IPL) thinning is a reliable indicator of retinal structural changes in PD.
  • A strong structural-functional correlation exists, highlighting the retina's role in PD.