Wiktionary
a. Without a lens or lenses.
Usage examples of "lensless".
It seemed to be a lensless system depending on folded optics and a paper-thin electronics sandwich of an image plane that transmitted the pictures on its face through a pea-size FM device.
The yellow petal-limbs had darkened noticeably at the edges and along the center creases, and the secondary lensless eyes in a row between the walking limbs were turning cloudy.
Above the waistband, the lower set of eyesthe lensless ones that sent biorhythm signals to the structures that corresponded to the pineal gland in the human midbrainhad gone milky, signifying a new stage of endocrine changes.
It takes all sorts of forms: our single-lens eyes, the compound eyes of insects, the lensless pinhole-camera eyes of nautiluses.
Lensmen did not ordinarily use their Lenses on their Lensless friends, but this was no ordinary occasion.
He turned to the Lensless Lensman, now standing quietly before his desk.