The antonyms for the phrase "screwed up eyes" could include "wide-open eyes," "bright eyes," "alert eyes," "wide-eyed," "unhindered sight," "clear vision," "open gaze," or simply "relaxed eyes". All these phrases convey an opposite meaning to the physical act of screwing up one's eyes, which can suggest squinting, frowning, or experiencing discomfort or confusion. The antonyms suggest an expression of awareness, clarity, and relaxation. A person with wide-open eyes may appear excited, curious, or attentive, while relaxed eyes suggest a calm or meditative state. The choice of antonym depends on the context of the situation and the desired emotional expression.