Jisho

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Noun
1. magic eye (in radio receivers, etc.)
Wikipedia definition
2. Magic eye tubeA magic eye tube gives a visual indication for audio output, radio-frequency signal strength, or other functions. It is also called a cat's eye, or tuning eye tube. These tubes were used by radio receivers from around 1936 onwards, replacing the earlier "Tuneon" neon lamp type tuning indicators, as a tuning aid.
Read “Magic eye tube” on English Wikipedia
Read “マジックアイ” on Japanese Wikipedia
Read “Magic eye tube” on DBpedia

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