Dont know what I did but the eye tool has dissappeared. Also when I go back to a layer to edit say text, the layers after that all vanish! What am I doing wrong?
Hm-m, that is odd.
The first thing that I would explore would be to Reset your Workspace to the default.
If that does not get the correct icons back, and with your comments on Layer behavior, I sort of doubt that it will, then trash the Preferences. PS will reset the Preferences to default. Note: you will then need to customize any Preferences, such as Scratch Disks, Cursors, etc., if you had changed those settings from the default.
That's been reported here before, but I'll be darned if I can remember what the solution was... A search for "brush layer visibility icon" or similar might turn the info up.
Some advice beyond what Bill has suggested: