Sold in Guardian - Singapore, these glasses claim to improve vision over time, citing the application of Bates method.JW: The Bates method has little scientific proof of its successes and some principles are perhaps harmful, IMO.
The Pinhole glasses works one of the two principles, depending on who you believe:
1. by reducing the light, forcing you to squint your eyes, thereby improving the image. The belief is that long time usage will strengthen the ciliary muscles which will improve vision in the long term.
source: http://www.independent.co.uk/life-style/health-and-families/health-news/the-truth-about-pinhole-glasses-1253113.html
2. the beams of lights reduces the circles of confusions and improve the depth of field. This is optical principle.
source: http://en.wikipedia.org/wiki/Pinhole_glasses
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