Related by context. Frequent words. (Click for all words.) 65 magnifying glasses 60 eyepieces 58 magnifying lens 58 magnifiers 57 loupe 57 microscopes 55 pinhole cameras 55 eyepiece 55 magnification 54 magnifier 52 magnifying glass 52 lenses 52 Binoculars 52 anatomical structures 51 scanning electron microscope 50 optical microscopes 50 magnifications 49 viewfinders 49 haloes 48 photometer 48 binocular 48 spyglass 48 irregular shapes 48 laparoscope 48 fluorescing 48 prisms 48 microscopic 48 scopes 47 microelectrodes 47 polarized glasses 47 tweezers 47 Doppler ultrasound 47 monocular 47 curved surfaces 47 Microscopes 46 imager 46 apertures 46 periscopes 46 pencil eraser 46 camera obscura 46 lasers 46 radioactive tracer 46 refracting 46 infra red cameras 45 bifocal 45 protractors 45 scanning tunneling microscope 45 tongue depressors 45 fluorescent light 45 electron microscopes 45 speculum 45 CAT scans 45 stethoscopes 45 kaleidoscopes 45 infrared 45 sensor arrays 45 measuring spoons 45 binoculars 45 reflectors 45 pinholes 45 keyholes 45 computed tomography CT scans 45 telescopic sights 45 nanosized 44 macro lens 44 near infrared spectroscopy 44 frequency comb 44 optical microscopy 44 astronomical objects 44 shiny metallic 44 optical coherence tomography 44 geometric shapes 44 spotting scopes 44 iridescence 44 curvatures 44 radiographs 44 eyeglass lenses 44 eyeglass frames 44 grippers 44 shutter glasses 44 stylus pen 44 intravascular ultrasound 44 infra red 43 ultrasonic waves 43 X ray beams 43 microscopic imager 43 flashlights 43 spectrographs 43 endoscopes 43 spectrophotometers 43 fluorescent 43 infrared rays 43 electron microscope 43 photonic crystal 43 infrared laser 43 bifocals 43 celestial objects 43 biological molecules 43 refractive error 43 telescopes 43 elastics