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00211_Field_211.txt
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1997-10-28
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OPHTHALMOMETER MEASURING TECHNIQUE
Making the Measurement
The readings are recorded with the one nearest horizontal written first as:
horizontal power @ meridian; vertical power @ meridian
For example:
43.00 @ 180; 44.00 @ 090
Sometimes the reading is given as:
horizontal power/vertical power @ meridian
The difference in the two dioptric values is the corneal toricity (often referred to as the corneal astigmatism).