How to make a cross eye
You can make a cross eye effect with any type of eye picture by using this example, It will surly help you to make this effect.
Take a picture: Capture any eye picture as I have here.
Selection: Make selection of the eyeball by using Polygonal lasso tool (L key) and make copy.
Clone stamp: Choose clone stamp tool (S key) and make formatting as given here.
Take color: Now click mouse at this point to take same color then scroll mouse in the selection as I have done here.
You will get it.
Paste eyeball in the picture and set it as looking real effect.
This is your final result.