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Non-motor symptoms, such as vision problems, occur earlier during disease progression and could be caused by altered retinal functioning. Various techniques exist to detect retinal alterations and, therefore, could provide biomarkers for earlier diagnosis of PD. The aim of this project is to determine potential retinal biomarkers for PD by using electroretinography (ERG) and pupillometry. In vivo measurements were performed on four non-human primates, before and after they were rendered parkinsonian by administration of 1-m\u00e9thyl-4-ph\u00e9nyl-1,2,3,6-tetrahydropyridine (MPTP), a neurotoxin that induces degeneration of dopamine neurons. ERG results showed a significant increase in photopic b-wave implicit time and reduced oscillatory potential (OP) amplitudes in both photopic and scotopic conditions following MPTP administration. The post-illumination pupillary response showed a consistently larger pupil diameter post-MPTP. Post-mortem examination revealed a significant thinning of the outer nuclear retinal layer. Tyrosine hydroxylase and melanopsin-containing cells were reduced in MPTP-intoxicated monkeys. 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