EyeCandy is a little texture mod (so far)
that will give you options to changing all 3 protagonists eye colours...so far only Franklin has been done and has 4 natural eye colours.

~Franklin
-Green
-Blue
-Light Blue
-Grey

-Brown (original , its the backup file in case something goes wrong)
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You need OpenIV.
[Instructions]
Extract content from "EyeCandy.zip" to any folder

Open up your OpenIV

Go to x64v.rpf > models > cdimages > streamedpeds_players.rpf > player_one

Now type in Search box in top right of Open IV

"teef"

2 Files should show up , go into Edit Mode and replace the "teef_diff_000_a_uni.ytd" file
Choose one of the files from the folders you had extracted before.
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Feel free to suggest me more pupil or general eye colours that you want and I will make them and add them to my v2