Eyepatches were also used to condition the eye so that pirates could fight in the dark. Long John Silver, the lead pirate character of the novel ‘Treasure Island’ had an eye patch. When you visualise a pirate, what comes to mind? You probably see a skull and crossbones flag, a three-cornered hat, and almost invariably, eye patches.
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An eye patch is used to occlude, or block, the view in the strong eye for a little while. An eye patch serves this purpose by encouraging use of the weaker eye. Prevent Blindness, a voluntary organization serving children with eye issues, notes that all a child with a lazy eye needs to do is wear a patch while putting their eyes to work.