Fics like Hindsight is 20/20

Mitsuru Tenji’s life used to be measured in millimeters and diopters. As an optician, he lived by a simple code: everyone deserves "Ten-ni"—the perfect 2.0 vision. He never expected to be practicing his trade in the middle of a pre-industrial wasteland where the "Eye of Insight" is a bloodline trait and "vision" is usually something people die for. Dropped into a remote, neutral trade town far from the active skirmishes of the Uchiha and Senju clans, Mitsuru doesn't try to be a hero. He just tries to be useful. He builds a life in the shadows of the conflict, grinding lenses from quartz and teaching the local blacksmiths about the geometry of light. To the villagers, he is a wizard of glass; to Mitsuru, he’s just a man trying to fix the world's most preventable headaches. But word of the "Man Who Sees the Unseen" spreads fast in an era defined by Doujutsu. TL;DR What would happen if an optician and an optometrist from our modern world is dropped into the Warring States Period?

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