beta-me ベタ目

In manga, beta-me ベタ目 are eyes drawn completely black, without highlight or distinct iris and pupil, or eyes draw in a single color other than black other than black, or eyes drawn without a highlight.

It's also spelled beta-me ベタ眼.

Character: Shinkouhyou 申公豹
Manga: Houshin Engi 封神演義 (Chapter 8, 序章の終わり)

Basically, in manga beta ベタ means an area filled with black ink, but eyes drawn pure black in manga are sometimes drawn with highlights in close-up panels, or in anime adaptations, so the term is kind of vague.

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