Ajay Shinde Since I am an Optometrist who is practising spectacle dispensing, I was once asked by a close friend of mine, "How effective are the blue block lenses? Do they help if one spends a lot of time on screen? To understand this, one must have some basic knowledge about light and colour. During our school days, we have been taught that white light consists of seven colours, "VIBGYOR", of which the violet to blue have higher energy being…
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