The risk of incident contrast sensitivity (CS) impairment is increased with factors such as cadmium exposure and older age, according to a study published online Sept. 13 in JAMA Ophthalmology.
Reduction in contrast sensitivity can be difficult to measure in clinical practice. However, we run across people that have complaints of reduced CS: trouble driving at night, words having shadows around them while reading, etc.
Honestly, I had no idea how people would be exposed to cadmium. It turns out that it is in the soil and water in areas of heavy industry. The biggie, though, it is a large by-product of smoking.
Another reason to quit. Potentially have better vision as you get older.