Hi

You should take them to a reptile vet. and have them look at the geckos eye's, because it could be an eye infection. I do not keep my geckos on sand and never would because of things that could happen, so I use a newspaper/papertowel substrate, and even with that kind of ground cover two of my geckos started having that kind of eye trouble and I took them to the vet. and they both had an eye infection. So consider taking them.

Take Care