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naked eye

noun
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Definition of naked eye

: the eye unaided by any instrument that changes the apparent size or distance of an object or otherwise alters visual powers just visible to the naked eye

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“Naked eye.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/naked%20eye. Accessed 28 January 2020.

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