I got some in my eye a few years ago. Some resin was on the back of my hand and I rubbed my eye and as avo says, it don't half sting like heck and the pain is instant as soon as you've done it.
Each morning when I woke up, that eye was blurred for a while but seemed to improve after a shower.
About a week later when it was irritating like hell and my eye was becoming very sensitive to sunlight and then daylight and it felt like I had the start of a cold, I went down the eye hospital. (I don't know if all hospitals have an eye hospital but Brighton does)
It took less than a minute to remove 3 bits of resin from my eye and was completely painless.
The lady said that I was fortunate that I hadn't scratched the eye, considering the amount of time passed, but I did have the start of an infection that might or could have caused problems.
What was odd was the drops they put in my eye made my snot go bright orange/yellow for about half an hour afterwards.
Now I'm very very very carefull to wash resin of my hands as it's not toxic to touch but get it in your eyes and you'll know all about it.