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| View Original: | Double-angle diagram of vectors for SimK, refraction, and ORA.jpg (810x591) | |||
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| Keywords: Double-angle diagram of vectors for SimK, refraction, and ORA.jpg en wikipedia 2013 July 23 This is from the same patient as illustrated in File Polar diagram of vectors for SimK refraction and ORA jpg In this double-angle vector diagram the angles from the polar diagram Figure 5A have been doubled to convert to Cartesian coordinates but the magnitudes length of the vectors remains the same This view better shows how ORA is the vectorial difference between refractive and corneal astigmatism ;Other information This figure was first used in the Wikipedia entry for the Alpins method of astigmatism analysis Screen grab of a PowerPoint slide I made using standard PPT drawing tools 2013-07-13 Kcroes Cc-zero Original upload log en wikipedia Sfan00_IMG CommonsHelper en wikipedia Double-angle_diagram_of_vectors_for_SimK 2C_refraction 2C_and_ORA jpg 2013-07-22 22 35 Kcroes 810×591× 58769 bytes <nowiki>Uploading a self-made file using File Upload Wizard</nowiki> Uncategorized 2013 July 23 | ||||
