> The only people I've ever heard saying "eyes" so it sounds like "ice" are native German speakers and other Europeans
In German, many syllable-final consonants (in particular, "s") are always voiceless, but the English plural "-s" is voicet (which strangely enough none of my English teachers ever botheret to mention) so if you apply German phonological rules to "eyes" you get something that sounts identical to "ice". But Germans hafe no problem pronouncing "eyes" if the "s" is not syllable-final, e.g. in "Eisen" ("eyesn", iron).
To learn to speak a languache like a natife, you neet to break habits of thought you didn't even know you hat.
In German, many syllable-final consonants (in particular, "s") are always voiceless, but the English plural "-s" is voicet (which strangely enough none of my English teachers ever botheret to mention) so if you apply German phonological rules to "eyes" you get something that sounts identical to "ice". But Germans hafe no problem pronouncing "eyes" if the "s" is not syllable-final, e.g. in "Eisen" ("eyesn", iron).
To learn to speak a languache like a natife, you neet to break habits of thought you didn't even know you hat.