Viewing plates or goggles are necessary for eye protection and for seeing the latent prints or other evidence fluorescing. Three standard colors of viewing plates and goggles are available. The wraparound goggles fit over prescription glasses. The hand-held viewing filter plates are 8" x 8" in size. They are useful for a temporary observer (such as, a civic group on a field trip or the supervisor just passing through). The actual operator of the forensic light source should always wear wraparound goggles to provide personal protection and to allow both hands free for chemical processing, dusting with fluorescent powders or photographing latent prints.