1.
naked eye; unaided eye; uncorrected vision
Seeing without glasses, contact lenses, or any optical aid. Used both in everyday contexts about vision correction and in scientific contexts about observation without instruments.
裸眼では見えない。
It's not visible to the naked eye.
裸眼視力は左右とも0.3です。
My uncorrected vision is 0.3 in both eyes.
あの星は裸眼でも観察できるほど明るい。
That star is bright enough to observe with the naked eye.
Composed of 裸 (naked, bare) + 眼 (eye). Literally means bare eyes — eyes without any optical aid.
COMMON COLLOCATIONS:
- 裸眼視力 (uncorrected visual acuity)
- 裸眼で見える (visible to the naked eye)
- 裸眼で観察する (to observe with the naked eye)
- 裸眼で生活する (to go about daily life without glasses)
SIMILAR WORDS:
- 肉眼 — naked eye; very similar but more commonly used in scientific contexts for observation without instruments
- 矯正視力 — corrected vision (with glasses/contacts); the opposite measurement
USAGE:
At eye exams in Japan, 裸眼視力 (uncorrected vision) is measured first, followed by 矯正視力 (corrected vision). Japan uses a decimal scale (e.g., 1.0, 0.5) rather than the Snellen fraction used in English-speaking countries.