There is an eye replacement tutorial at Video Copilot that you should probably look at.
However, to answer your specific question, you should be able to parent the irises to the whites.
However, before you jump too far ahead of yourself and get frustrated, you should really start here. These resources are intended for someone new to AE to give them a solid foundation in the important, fundamental things about AE (and they would have answered your question).
Hi, The video copilot is very helpful, I have looked at a lot of eye videos this
is a good one. However I have parented the iris to the white eye layer and it
does not move with the eye. Also I cannot bring mask up despite clicking m and
highlighting the iris layer, what should i do? So I cannot track it either
separately. Is it the tracking that is wrong or a corruption in the eye iris
file or am I missing something small? Is there another way to make a mask part
to the layer? or should I make another layer then bring the iris in on top of
You need to give us a screenshot at least. If you parent one layer to another and moving the parent does not move the child then that layer has an effect applied to it that generates pixels based on the comp window and not the layer. We need to know all about your composition. The best way to do that is to select all your layers, press the U key twice to reveal everything that is changed on the layer, show us all of the layers you are having problems with on in your composition and then take a screenshot. use the little camera icon at the top of the reply box to upload the full size screenshot and give us a look.
If the popup does not appear to work try it again. Sometimes the script does not completely run but opeing the upload image pop-up almost always works perfectly on the second try.
Put your project up for us to see and we can help.
Hi I have included a screen shot, hope this helps. I can see on the video copilot how to add a shadow around the eye which will make it more realistic and I know how to cut abit off the round eyeball bit if only I could get it to stick to the white part.
I am not sure if I have added the screen shot right I just uploaded and then pressed insert but nothing happened, where can you see if it is inserted in this email?