There are other factors that need to be considered when vision testing. These include the ability of the person to distinguish greyscales and contrast and how this is tested and recorded. Some inspections are performed under ultraviolet lighting conditions and currently there are no requirements for an evaluation of a person's ability to see the fluorescent indications or whether they are able to work safely and efficiently in ambient background lighting conditions of less than 20 lux. As we age, our visual perception declines, but our brains have been trained to recognise patterns and indications and tend to compensate for the decline.
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