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What defines an ergonomic loupe
Ergonomic loupes are a category, not a marketing phrase. The two technical levers that actually change posture are (1) prismatic optics that let you keep your head upright while the optical path tilts down, and (2) working distance and declination that are matched accurately to the user. Brands describe this differently — declination angle, ergonomic mount, posture-forward — but the underlying physics is the same: the head stays neutral, the eyes do the looking.
