pinhole camera, enlarger, convex lens, aperture, lens, viewfinder, camera lens, camera obscura, eyepiece, collimator, magnifications, lense, keyhole, laparoscope, photogram, refractor, pentaprism, annular, vignetting, incision, iris diaphragm, retroreflector, prisms, plexiglas, spectroscope, splashback, bleb, collimation, coronagraph, auditory canal, fisheye, eyehole, newtonian telescope, telescope, cryostat, pyrometer, speculum, perforations, vitreous humor, ophthalmoscope, opacities, ostia, borescope, loupe, fundus, stereographic, endoscope, sigmoidoscope, astrophotography, diverticular, polyhedron, septum, cuvette, glassless, laryngoscope, orifice, opacification, parabolic mirror, superior vena cava, otoscope, atrial septal defect, flashgun, lunette, image intensifier, embroidery hoop, cavity, photometer, underpainting, photopolymer, kirlian, darkroom, crystalline lens, pellicle, penlight, pyrography, fluorescein, cautery, toroid, slits, semitransparent, protrusion, monochromator, scintillator, nosepiece, diaphragm, chromatic aberration, endotracheal tube, punctum, reflector, stroboscope, ambrotype, trapezium, stipple, conjunctiva, lesion, ileocecal valve, needlenose pliers, venturi, nozzle, cyanotype, flange, pores, slit, dial, dot, spool, hole, square, bobbin, panel, sheave, dowel, rectangle, bolt, cage, compartment, cutout, pane, slot, infrared, imaging, mm, panoramic, anamorphic, intraoral, lapse, pyroelectric, sensor, stereoscopic, telescopic, cinemascope, detector, electrode, element, gated, grating, holographic

puncture