phototonus Definition

optogram, photoscope, sensitometer, photopsia, photalgia, optography, calorescence, lucific, photodynamics, photoreactivation, exposure meter, scotomy, tithonic, sensitivity, somesthesis, tithonographic, luminous energy, chionablepsia, holophotal, photovisual, photoglyphic, triboluminescence, visual property, holophote, leucoscope, abirritant, diacaustic, luciform, dioptrics, light, flash photography, rutilant, actinic radiation, photokinesis, spectral type, scioptics, photobiotic, light meter, time exposure, anaclastics, lucimeter, interreflection, irritation, stereomonoscope, moon blindness, rutilate, somesthesia, lippitude, erythematic, excandescent, ophthalmometer, excandescence, photoheliograph, chromophane, candent, photographometer, coenesthesis, zeitgeber, hyalotype, photomagnetic, isochromatic, osmophobia, counterglow, luciferous, brightness, albugo, scintillation counter, ray of light, owllight, leucoma, diactinic, light unit, illumination unit, chromatrope, atmospheric perspective, beamless, spectroheliograph, night blindness, optical device, field of vision, spectrohelioscope, illumination, diaheliotropism, color property, radiant energy, aqueous humour, thermotype, teinture, chromophotography, electrooculogram, diradiation, achromasia, lucifugous, parhelic circle, sweetness and light, photodisintegration, abirritate, sensific, ultramicroscope, eradiation,