This is the 2971st most frequent Polish word.
oczu
Genitive plural form of "eyes."
The word "oczu" is part of the instrumental form "oczami," denoting the means by which the action of seeing is performed.
Widzę piękno natury oczami.
I see the beauty of nature with my eyes.
Here, "oczu" is used in the genitive case to express possession or association with the eyes.
Nie mogę oderwać oczu od tego krajobrazu.
I can't take my eyes off this landscape.
In this sentence, "oczu" indicates the genitive plural form connecting the drops to the eyes, showing to whom or what the drops pertain.