astigmatism against the rule

a·stig·ma·tism a·gainst the rule

astigmatism in which the greater curvature or refractive power is in the horizontal meridian.
Farlex Partner Medical Dictionary © Farlex 2012
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In the present series, 19 cases (31%) showed with the rule astigmatism, 21 cases (36%) showed astigmatism against the rule and 20 cases (33%) showed no astigmatism preoperatively, 16 cases were in the range of 0.50D to 1.0D and 12 cases were in the range of 1.0D to 1.50D.
Removal of corneoscleral sutures later on, may be a factor of charge of astigmatism against the rule.
Larger sutures allows the wound to gape thus reduces vertical curvature hence astigmatism against the rule.
A self-sealing corneal tunnel incision measuring 4.0 to 4.1 mm in external diameter and 6.5 to 7.0 mm in internal diameter (stretch incision) was performed on the steeper axis and the results suggested that surgical induced astigmatism (SIA) following superior incisions in cases of astigmatism with the rule (n = 29) amounted to 1.93 +/- 0.97, while lateral incisions in cases of astigmatism against the rule (n = 29) led to an IA of 1.35 +/- 0.73.