Antonyms for "ocular line" can be many as the term is quite specific. Some of the possible antonyms are "non-visual", "unseen", "invisible", "hidden", "obscure", "non-apparent", "non-manifest", or "non-observable". These words suggest the lack of visibility or visibility-related features. As opposed to "ocular line", which refers to a visible line or a line of sight, these antonyms describe something that cannot be seen, observed, or detected. The concept of antonyms is an essential element in language learning, as it helps to understand the semantic relations between words and their corresponding meanings.