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Magnifying the Jackal’s unflinching eye is a bespoke telescopic eyepiece that peers into the soul of the killer seconds before he pulls the trigger.

I wear it forward when the lights are too bright but otherwise backward because it helps keep my eyepiece in place.

Her children gazed into the eyepiece at strange, eight-legged creatures clambering over the moss.

It wasn’t even a distant gleam yet in Lewis and Clark’s eyepiece.

A magnifying eyepiece, produced by 3D printing, fits cellphone cameras and takes photos of microscope slides; AI image analysis then picks out and identifies pathogens.