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. Individuals’ fields of vision differ and again this is currently not evaluated. There is a mention of corrected vision; does this apply to people who have had corrective medical procedures or only to those people who wear glasses and contact lenses? Are all inspections undertaken in the near distance range, or are they in the far distance range? Having read the three short articles on vision testing that have appeared in NDT News over the last few months, I hope you are more aware that the measuring of a person’s vision is not quite so straightforward and I now feel that my view of the subject had previously been rather blinkered (this is the final cringe-worthy comment I have on this subject).
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