Reva I think it can be a combination type of situation with some night vision normally occurring as one gets older but maybe the Parkinson's makes it worse because of the thinning of the retina that can often be seen in Parkinson patients

My inability to see well after dark , started as I aged. Years before PD.

Red Light Improves Vision of Aging Eye
https://www.aao.org/eyenet/article/red-light-im...

Red Light Improves Vision of Aging Eye

https://www.aao.org/eyenet/article/red-light-improves-vision-of-aging-eye

3 minutes of deep red light can improve a person’s vision
https://www.medicalnewstoday.com/articles/3-min...

3 minutes of deep red light once per week may improve vision

https://www.medicalnewstoday.com/articles/3-minutes-of-deep-red-light-can-improve-a-persons-vision

Thank you for your reply.