| 摘要 |
The Advanced Astigmatism Testing Method provides a great improvement over standard Snellen charts in testing vision patients with astigmatism. An ophthalmologist/optometrist has the person view an illuminated sheet of white paper with a pair of L's and placed on the viewing wall. A person with astigmatism will see secondary images of the L's offset horizontally and/or vertically. The vision specialist will then vary lens settings as the patient reports the movement of the vertical or horizontal offset. It has been validated that after the vertical offset diminishes completely that the horizontal offset can likewise be reduced to zero. The lens settings are recorded and serve as the basis for the lens prescription.
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