Astigmatism 

2. The Importance of Palming

palming_for_inner_light-outersight_.pdf
File Size:	1083 kb
File Type:	pdf

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1. How to Use Pinhole Glasses Sheet
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how_to_use_pinholes.pdf
File Size:	429 kb
File Type:	pdf

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Youtube Video: 
- The science behind pinholes
 How & Why Pinholes Work:

2. VIDEO: What you need to know about Astigmatism 
6 minutes 30 sec.