Related by context. Frequent words. (Click for all words.) 70 eyepiece 61 lenses 59 monocular 58 shutter glasses 58 binocular 58 polarized glasses 57 magnifying lens 57 magnifications 56 laparoscope 56 magnification 55 loupe 54 lens 53 viewfinders 53 spectrographs 52 prisms 52 telescopic 52 Lenses 52 diffractive 51 active shutter glasses 51 telescopic sights 51 microscopes 51 WFC3 51 CCD camera 51 imager 51 magnifying glasses 50 scopes 50 aperture 50 Binoculars 50 FOV 50 anatomical structures 50 magnifier 50 baseplate 50 transmissive 50 telescope 50 IOLs 50 magnifiers 49 photometer 49 optics 49 macro lens 49 headlamps 49 optical microscope 49 polarized sunglasses 49 corrective lenses 49 polarized lenses 48 wavefront 48 3x zoom 48 parallax barrier 48 curved surfaces 48 optical microscopes 48 binoculars 48 Fresnel lens 48 apertures 48 parallax 48 periscopes 48 viewfinder 48 focal lengths 48 Venetian blinds 48 periscope 48 frameless 48 scanning tunneling microscope 48 interferometer 48 gimbal 47 3x optical zoom lens 47 InGaAs 47 camera lens 47 tripod mounted 47 imagers 47 3D glasses 47 binocular vision 47 tripod mount 47 reticle 47 spotting scopes 47 reflective surfaces 47 telescopes 47 styli 47 glasses 47 tripod 47 Microscopes 47 laser rangefinder 47 Cosmic Origins Spectrograph 47 cylindrical 47 JWST 46 eyeglass lenses 46 retractor 46 infrared beam 46 photodiodes 46 headlamp 46 sunlight readable 46 transmittance 46 spectrometers 46 Velcro straps 46 SP #UZ 46 refractive error 46 optical zoom lens 46 goggles 46 halogen lights 46 zoom lens 46 optical coherence tomography 46 fisheye 46 reflector 46 spherical