An improved method of using a fan-dial astigmatic chart. To enhance accuracy in measuring astigmatism subjectively.

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  • 放射線乱視表の巧妙な使い方　　自覚的屈折検査で乱視の精度を高める為に
  • To enhance accuracy in measuring astigmatism subjectively
  • 自覚的屈折検査で乱視の精度を高める為に

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Description

As a measure to confirm the accuracy of astigmatic correction, using a fan-dial chart, there is a technique of shifting the cylinder axis back and forth purposely.<br>Expanding this technique, a table was completed which enables to read off possible errors in both power and axis simultaneously, from the directions of darker lines noticed in shifting the axis +10 and -10 degrees respectively.<br>This method, tentatively called “the Double-shift Method”, is described in detail, explaining the use of the table and its application in determining astigmatism.

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