The (plastic) filter goggles are used for viewing the fluorescence of traces or materials where the light that is used to induce the fluorescence is absorbed by the goggle (fluorescence has a longer wavelength.) They are supplied in a protective  case. They can be worn comfortably over prescription glasses. The clear goggles are used with UV-light.

The yellow with blue light (for example Basic Yellow 40).

The oranje are for example used for searching semen traces with 450 nm lighting, or with Rhodamine 6G stained cyano acrylate with 505 nm lighting.

The red is for example used for viewing the fluorescence of 1,2-IND or DFO with 530 nm lighting.