After reading in Ayurvedic literature and under the advice of Ayurvedic doctor, I started using pure mustard oil for eye care. One drop of this oil put in each eye thoroughly cleanses the eyes. I drop this oil in eyes once every 15 days.
I have been doing the above for 15 years and have been maintaining good eye health. My spectacle still uses the same power of the lens which it used 15 years ago.