The average sliding 31-day rainfall during September in Dublin is increasing, starting the month at 2.1 inches, when it rarely exceeds 3.5 inches or falls below 0.6 inches, and ending the month at 2.6 inches, when it rarely exceeds 4.3 inches or falls below 1.1 inches.
Astigmatism can be diagnosed through a comprehensive eye examination. Testing for astigmatism measures how the eyes focus light and determines the power of any optical lenses needed to compensate for reduced vision. This examination may include: 1  Visual acuity âAs part of the testing, you'll be asked to read letters on a distance chart.
fan and block test A test for determining the axis and the amount of astigmatism of the eye. It consists of an astigmatic fan chart with an inner rotating central disc on which are printed an arrowhead forming an acute angle of typically 60Âº and two sets of mutually perpendicular lines or 'blocks'.