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Visual hallucinations and illusions in Parkinson's disease: the role of ocular pathology.

Abstract：

INTRODUCTION:Whether different mechanisms, particularly ocular pathology, could lead to the emergence of visual hallucinations (VH) (defined as false perceptions with no external stimulus) versus visual illusions (VI) (defined as a misperception of a real stimulus) in Parkinson's disease (PD) remains debated. We assessed retinal, clinical and structural brain characteristics depending on the presence of VH or VI in PD. METHODS:In this case-control study, we compared retinal thickness using optical coherence tomography (OCT), between PD patients with: VI (PD-I; n = 26), VH (PD-H; n = 28), and without VI or VH (PD-C; n = 28), and assessed demographic data, disease severity, treatment, anatomical and functional visual complaints, cognitive and visuo-perceptive functions and MRI brain volumetry for each group of PD patients. RESULTS:Parafoveal retina was thinner in PD-H compared to PD-C (p = 0.005) and PD-I (p = 0.009) but did not differ between PD-I and PD-C (p = 0.85). Multivariate analysis showed that 1/retinal parafoveal thinning and total brain gray matter atrophy were independently associated with the presence of VH compared to PD-I; 2/retinal parafoveal thickness, PD duration, sleep quality impairment and total brain gray matter volume were independent factors associated with the presence of VH compared to PD-C; 3/anterior ocular abnormalities were the only factor independently associated with the presence of illusions compared to PD-C. CONCLUSION:These findings reinforce the hypothesis that there may be different mechanisms contributing to VH and VI in PD, suggesting that these two entities may also have a different prognosis rather than simply lying along a continuous spectrum. REGISTRATION NUMBER:Clinicaltrials.gov number NCT01114321.

journal_name

J Neurol

journal_title

Journal of neurology

authors

Marques A,Beze S,Pereira B,Chassain C,Monneyron N,Delaby L,Lambert C,Fontaine M,Derost P,Debilly B,Rieu I,Lewis SJG,Chiambaretta F,Durif F

doi

10.1007/s00415-020-09925-x

subject

Has Abstract

pub_date

2020-10-01 00:00:00

pages

2829-2841

issue

eissn

0340-5354

issn

1432-1459

pii

10.1007/s00415-020-09925-x

journal_volume

267

pub_type

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Visual hallucinations and illusions in Parkinson's disease: the role of ocular pathology.