@Bevoudini there are probably many reasons the eyes are invisible.
• Check if your mods are correctly installed.
• You may take a look at the plugins with FNVedit :
The right column shows the last mod that modifies the PNJ, the whole section will be applied. Check if the parameter is correct, modifies it eventually to test it with vanilla eyes, or check if you have the meshes in the correct paths in your data folder.
Hope this helps