Question: what is a severe astigmatism?
Answer: Mild Astigmatism < 1.00 dioptre Moderate Astigmatism 1.00 to 2.00 dioptres Severe Astigmatism 2.00 to 3.00 dioptres Extreme Astigmatism > 3.00 dioptres. Astigmatic people may suffer from headaches, tired eyes and sensitivity to bright lights.