nothing in eye but it is kept shut??

[cocogecko]

My leo seems to be keeping one of its eyes shut. When it opens it doesn't open fully. When i dripped water in it it opened fully but i don't see any shed or anything else in there. After awhile it goes shut again. Any idea what's going on??

 

[katie_]

My leo seems to be keeping one of its eyes shut. When it opens it doesn't open fully. When i dripped water in it it opened fully but i don't see any shed or anything else in there. After awhile it goes shut again. Any idea what's going on??

Could be a scratch.
The vet may be able to do a stain and see.