In our Hindu religion we perform different ritual and cultures for different purpose . As we know our Hindu Religion is most ancient and full of scientific research if we want to know about it . It like a mystery which we solve and being a healthy person in our day to day life .
In morning when we gave water to sun (Surya ardh ) then we need to maintain a high distance and between their water fall we see Sun . During see Sun from that waterfall our Eye related problem like pain are decrease because they are work as medicine but it work when you see it with full concentration and your eye see Sun from the rays of Water
You don’t need to believe me if you not .You may try it practically we all have a water and in the sky sun . Please try it . It really working , I tried practically then explain it .