Modifiers matching constant:

• physical,
• acoustic,
• elastic,
• macroscopic,
• fundamental,
• fixed,
• optical,
• physiological,
• important,
• relevant,
• auxiliary,
• ordinary,
• mental,
• kinetic,
• molecular,
• symbolic,

Simple categories matching optical:

• marker,
• property,
• input,
• instrument,
• structure,
• concept,
• catalyst,
• material,
• munition,
• part,
• system,
• particle,
• hardware,
• waveguide,
• application,
• devices,
• fibre,
• quality,
• medium,
• scopes,
• point,
• reflector,
• surface,
• sensation,
• carrier,
• instrumentation,
• coupler,
• component,
• entity,
• module,
• equipment,
• pathology,
• processing,
• device,
• details,
• error,
• block,
• imperfection,
• field,
• machine,
• data,
• display,
• function,
• feature,
• assembly,
• procedure,
• activity,
• consideration,
• article,
• amplifier,
• substance,
• switch,
• magazine,
• reader,
• base,
• information,
• process,
• communication,
• measurement,
• contrivance,
• image,
• parameter,
• communications,
• element,
• mode,
• artifact,
• film,
• disc,
• drive,
• losses,
• disk,
• disorder,
• disease,
• performance,
• pattern,
• crystal,
• energy,
• experiment,
• market,
• dielectric,
• condition,
• coupling,
• lens,
• perturbation,
• command,
• paraphernalia,
• wave,
• state,
• irregularity,
• attribute,
• substrate,
• detector,
• coating,
• power,
• phenomenon,
• case,
• characteristic,
• fiber,
• lense,
• filter,
• elements,
• section,
• aberration,
• product,
• distortion,
• appliance,
• unit,
• circuit,
• impression,
• implementation,
• indicator,
• texture,
• figure,
• interference,
• network,
• interaction,
• signaling,
• deflector,
• apparatus,
• value,
• item,
• correction,
• glasses,
• sensor,
• transformation,
• penalty,
• glass,
• force,
• plate,
• means,
• interferometer,
• portion,
• shutter,
• sheet,
• observation,
• quantity,
• effect,
• defect,
• layer,
• radiation,
• resin,
• solution,
• windows,
• object,
• measure,
• constant,