With-the-rule astigmatism has more plus power on the vertical meridian, as seen in this corneal topography

Jul 13, 2017 · Against the rule astigmatism ( +2.00 +1.00 x 180) In most cases of against the rule (ATR) astigmatism, the cornea is steeper in the horizontal meridian and flatter in the vertical meridian, which means more plus lens power will be required to neutralize the vertical meridian than to neutralize the horizontal.

Oct 19, 2016 · Figure 3. Zeiss Atlas Report. The tangential and axial curvature maps both show with-the-rule corneal astigmatism with more plus power in the vertical meridian. Specifically, the steepest meridian is at 083 degrees, and there are 2.88 diopters of astigmatism. The Placido disc image shows regular, concentric mires, indicating a healthy corneal ...

Figure 3: The axial curvature and anterior float Pentacam topography maps from the patient in Figure 1 reveal the characteristic high against-the-rule astigmatism pattern seen in patients with pellucid marginal degeneration.

Jul 31, 2015 · Also, more individuals have no astigmatism or with the rule astigmatism than those with against the rule or oblique astigmatism. Because with the rule astigmatism is around axis 90, you will already be set up to correct for with the rule astigmatism after you have neutralize the vertical meridian, with a horizontal streak.

Jul 12, 2022 · In those with higher risk of perforation, the use of protective eye wear is a cornerstone of management. For patients who experience visual disturbance secondary to high against-the-rule astigmatism, non-surgical management with spectacles, rigid gas permeable contact lenses, or scleral contact lenses is appropriate.

The severe superior stromal thinning is visible on anterior segment OCT and is creating a characteristic against-the-rule pattern of astigmatism. The patient was filtering aqueous through the area of superior thinning resulting in positive Seidel testing and creation of an adjacent conjunctival bleb.

§ If your patient has no astigmatism, there will be no motion. Retinoscopy is completed for this eye. § If your patient has ‘with the rule’ astigmatism, you will see ‘against motion’ which you will neutralize by adding minus cylinder axis 90 degrees away from …

Jun 12, 2018 · thinning most often begins superiorly, and patients ma y present with decr eased vision due t o worsening against-the-rule. astigmatism. In se vere cases, patients with Terrien marginal degeneration may present with corneal per foration following minimal trauma, or even spontaneously. Etiology/Epidemiology. F i g u re 2.

Topography showed regular bowtie with-the-rule astigmatism. Manual keratometry Manual keratometry was as follows: 43.00 @ 20° and 43.50 @ 110°. Non-contact biometry Non-contact biometry was performed and gave the following measurements: axial length 22.94mm, K1 42.72 @ 26°, K2 43.60 @ 116° (see Figure 1). Targeting plano, a 23.5D SN60WF