GaatjesBril
http://rasterbril.nl/informatie/hoe-werkt-een-rasterbril/ ![[WBL]](../../images/archive-org-icon-very-small.png){kind=icon}
Een rasterbril gebruik je wanneer je wazig / onscherp ziet in plaats van je gewone bril (op sterkte). Je kunt dit hulpmiddel gebruiken om je huidige zicht in stand te houden, of tijdens het verbeteren van je zicht middels de methode van natuurlijk zien.
De uitleg op de website van de rasterbril is accuraat.
Alleen is het zeker niet zo dat je er je huidige zicht mee in stand kunt houden.
Zie daartoe:
http://www.quackwatch.com/01QuackeryRelatedTopics/eyequack.html
Several entrepreneurs have marketed "pyramid" or "pinhole" glasses consisting of opaque material with multiple slits or perforations. The "technology" involved has been known for centuries and was used before glass lenses were invented. Light passing through a small hole (or holes) is restricted to rays coming straight from the viewed object; these rays do not need focusing to bring them to a point. Modern promoters claim their products are better than conventional lenses. Actually, both reduce the focus effort needed to read, but pinhole glasses are much less useful because they restrict contrast, brightness, and the field of view [38].
Worn as sunglasses, they can even be harmful because the holes allow damaging ultraviolet rays to reach the eye.