Visual Deficiencies due to Parkinson’s Disease: A Potential Biomarker
Vision deficiency has been reported in several cases of PD, characterized by dysfunction in acuity/contrast, color discrimination, and morphological changes to the retina/fovea. Older adults with and without PD were recruited with a classification below Stage 2 of the disease. All participants were tested for the 3 mentioned components of vision. The results of a multivariate analysis of variance (MANOVA) indicated an insignificant difference between the PD and control group in visual acuity (p > 0.05), color discrimination (p > 0.05), and morphological changes (p > 0.05). These findings lead to questions about the real effect of PD on visual capabilities, as literature shows an uncertain relationship between the two.