Dry eyes are a common issue for PwP and may actually be one of the earliest symptoms prior to diagnosis as outlined in the following articles :
pubmed.ncbi.nlm.nih.gov/193...
ncbi.nlm.nih.gov/pmc/articl...
pubmed.ncbi.nlm.nih.gov/160...
ncbi.nlm.nih.gov/pmc/articl...
pubmed.ncbi.nlm.nih.gov/211...
parkinsonsnewstoday.com/201...
ajmc.com/view/patients-with...
parkinson.org/Understanding...
parkinsonsdisease.net/clini...
aan.com/PressRoom/Home/Pres...
One possible solution to dry eyes and eye fatigue is the regular use of Maqui Berry Extract as the following two studies suggest :
pubmed.ncbi.nlm.nih.gov/252...
This second study is a 2019 Randomized, placebo Controlled double blind trial that confirms that Maqui Berry Extract in the form of "MaquiBright" is very effective for dry eyes and eye fatigue which is another common issue in PwP :
ncbi.nlm.nih.gov/pmc/articl...
Here are some links to several products at the best dose (60 mg/day) found in the studies :
vitacost.com/life-extension...
amazon.com/Tear-Support-Maq...
Based on the study and reviews, it sounds like it takes about 30 days to start seeing benefit and that benefit increases by the 60th day. Make sure it is the "extract version".
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