Please can you;
1. Provide a detailed reproduction explanation with used software. The more detail, the better we can diagnose your issue.
2. Post feedback in the Feedback forum, or better, on the GitHub Issues page as this helps us consolidate reports so that our QA teams can check them more efficiently.
GitHub Issues: https://github.com/CRYTEK/CRYENGINE/issues/
Can you tell us if the GameSDK characters render the eyes properly for you? If they do, you can try deleting your user folder that is generated to try to regenerate the shader cache.
/ Moved the the Feedback forum.