poor night vision

I lose my night vision walking down a dark trail with tall trees. My sight will fade at the edges like a tunnel then go completely I will see nothing. Also I seem to be blind to dark coloured things like a black and dark coloured cars. I am wondering what can be the cause or causes for this, and what I can do to improve my night vision.

[Jay616]

sorry if this is irrelevant but ive read test results saying that canabis was shown to help night vision so if you live in Massachusetts question 2 passing
might be more helpful than exspected. Sorry I couldnt be more help. You
might also look into other herbs there seems to be alot out there and I wouldnt be suprised if one was helpful to night vision

[John C Hagan III, MD, FACS, FAAO]

You've been reading scientific trash. Weed is bad on your lungs and causes many more problems than it helps.

You need to see an ophthalmologist ideally a neuroophthalmologist. Find one at www.aao.org

JCH MD