Optical variable device

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Anoptical variable deviceoroptically variable device (OVD) is an iridescent or non-iridescent security feature that exhibits different information, such as movement or colour changes, depending on the viewing and/or lighting conditions.^[1][2] The particular changes of appearance when rotating and tilting are reversible, predictable and reproducible.^[2] OVDs cannot be photocopiedorscanned, nor can they be accurately replicated or reproduced.^{[citation needed]} OVDs are often used as security devices and anti-counterfeiting measures on banknotes, government-issued identification documents, or credit cards. OVDs can be created through a combination of printing and embossing.