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In security printing, void pantograph refers to a method of making copy-evident and tamper-resistant patterns in the background of a document. Normally these are invisible to the eye, but become obvious when the document is photocopied. Typically they spell out "void", "copy", "invalid" or some other indicator message. [1]
Studies have been conducted on blue light filtering eyeglasses, [5] [27] which uses special blue light blocking lenses for eye protection against blue light. [ 27 ] [ 28 ] All visible light wavelengths can be transmitted through the spectacle lens, [ 28 ] but some portions of the blue-violet light spectrum are selectively attenuated by coating ...
Security printing is the field of the printing industry that deals with the printing of items such as banknotes, cheques, passports, tamper-evident labels, security tapes, product authentication, stock certificates, postage stamps, and identity cards. The main goal of security printing is to prevent forgery, tampering, or counterfeiting.
Relationship between practices of eye protection against solar ultraviolet radiation and cataract in a rural area. PLoS1 . History of sun light exposure is a risk factor for age-related macular ...
Eye protection is protective gear for the eyes, and sometimes face, designed to reduce the risk of injury. Examples of risks requiring eye protection can include: impact from particles or debris, light or radiation, wind blast, heat, sea spray or impact from some type of ball or puck used in sports.
Though historically used for vision improvement and correction, eyewear has also evolved into eye protection, for fashion and aesthetic purposes, and starting in the late 20th century, computers and virtual reality. The primary intention of wearing eyewear can vary based on the need or desire of the wearer.