About: Javal's rule

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Javal's rule is a mathematical formula used to estimate astigmatism based on keratometry readings. The estimate is useful for high cylinder measures, generally over -2.00 diopters.The estimate is found by multiplying the difference in power between the two meridians by 1.25 and factoring in the average lenticular astigmatism, which is -0.50 x 090.

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  • قاعدة جافال (بالإنجليزية: Javal's rule)‏ هي صيغةٌ رياضية تُستعمل لحساب اللابؤرية اعتمادًا على قراءات . يُعد هذا الحساب مهمًا في قياسات الأسطوانات العالية، عمومًا فوق -2.00 ديوبتر. يُستخرج الحساب عبر ضرب فرق القوة بين خطي الطول في 1.25 وتحليل متوسط اللابؤرية العدسية وهو -0.50 ضرب 090. (ar)
  • Javal's rule is a mathematical formula used to estimate astigmatism based on keratometry readings. The estimate is useful for high cylinder measures, generally over -2.00 diopters.The estimate is found by multiplying the difference in power between the two meridians by 1.25 and factoring in the average lenticular astigmatism, which is -0.50 x 090. (en)
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  • قاعدة جافال (بالإنجليزية: Javal's rule)‏ هي صيغةٌ رياضية تُستعمل لحساب اللابؤرية اعتمادًا على قراءات . يُعد هذا الحساب مهمًا في قياسات الأسطوانات العالية، عمومًا فوق -2.00 ديوبتر. يُستخرج الحساب عبر ضرب فرق القوة بين خطي الطول في 1.25 وتحليل متوسط اللابؤرية العدسية وهو -0.50 ضرب 090. (ar)
  • Javal's rule is a mathematical formula used to estimate astigmatism based on keratometry readings. The estimate is useful for high cylinder measures, generally over -2.00 diopters.The estimate is found by multiplying the difference in power between the two meridians by 1.25 and factoring in the average lenticular astigmatism, which is -0.50 x 090. (en)
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  • قاعدة جافال (ar)
  • Javal's rule (en)
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