Scoping review reveals early ophthalmic symptoms may indicate neurodegeneration in Parkinson’s disease.
Impairment of both color and contrast vision, as well as changes in optical coherence tomography (OCT), correlate with disease severity and cognitive decline. They can serve as an early, safe, noninvasive biomarker of neurodegeneration.
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Łach-Wojnarowicz et al. (2025) studied this question.
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