Difference between revisions of Astigmatism measurement
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Use the astigmatism fan. Best instructions from a quick search are https://www.slideshare.net/SeenaJose2/astigmatic-fan, though that's intended for optos so goes into a lot more detail and technology. | Use the astigmatism fan. Best instructions from a quick search are https://www.slideshare.net/SeenaJose2/astigmatic-fan, though that's intended for optos so goes into a lot more detail and technology. | ||
1. Find an astigmatism fan | 1. Find an astigmatism fan: https://duckduckgo.com/?t=ffab&q=astigmatism+fan&iax=images&ia=images | ||
2. As you move it away from your eyes, lines in one direction (axis of astigmatism) will start to blur. As you keep moving it away, more lines will blur. | 2. As you move it away from your eyes, lines in one direction (axis of astigmatism) will start to blur. As you keep moving it away, more lines will blur. | ||