| English | German |
| shift of the threshold wavelength | Verschiebung der Grenzwellenlänge |
| shift of the threshold wavelength | Änderung der Grenzwellenlänge |
| threshold of visibility | Unterschiedswahrnehmung (the threshold below which neither the cones nor the rods respond to a light stimulus) |
| threshold of visibility | Wahrnehmungsschwelle (the threshold below which neither the cones nor the rods respond to a light stimulus) |
| threshold of visibility | Sichtbarkeitsschwelle (the threshold below which neither the cones nor the rods respond to a light stimulus) |
| threshold of visibility | Sichtbarkeitsgrenze (the threshold below which neither the cones nor the rods respond to a light stimulus) |
| threshold of visibility | Schwellenwahrnehmung (the threshold below which neither the cones nor the rods respond to a light stimulus) |