PMC6858838_01
Scheimpflug-based corneal topography of the left eye (OS). (A) Preoperatively, demonstrating PMD pattern with inferior steepening associated with thinning and irregular astigmatism on the anterior sagittal map. (B) At day one following crescentic corneal wedge resection, showing regularization of the corneal astigmatism. (C) Four months postoperatively, showing marked steepening inferiorly. (D) Ten months postoperatively, showing recurring irregular astigmatism in the anterior sagittal map coinciding with inferior steepening and a minimum corneal thickness of 387mum.
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Both topographies showed PMD patterns with the steepest anterior point inferiorly displaced with associated thinning and irregular astigmatism on anterior sagittal maps (Figures 1A and 2A). The thinnest pachymetry on Scheimpflug imaging had improved to 470 mum (Figure 1B). The anterior sagittal topographical pattern on topography is however more irregular at this follow-up showing regression of the treatment with marked steepening inferiorly and loss of regular pattern (Figure 1C). On scheimpflug imaging the anterior sagittal map showed recurring irregular astigmatism with inferior marked steepening (Figure 1D).
Scheimpflug-based corneal topography of the right eye (OD). (A) Preoperatively, demonstrating PMD pattern with inferior steepening associated with thinning and irregular astigmatism on the anterior sagittal map. (B) Four days following combined corneal wedge resection and corneal cross-linking, showing regularization of the topographic pattern. (C) Eight months postoperatively, depicting a stable regularized anterior pattern with mild inferior steepening and a thinnest pachymetry of 452mum.
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Both topographies showed PMD patterns with the steepest anterior point inferiorly displaced with associated thinning and irregular astigmatism on anterior sagittal maps (Figures 1A and 2A). Topographical patterns were regularized with now oblique 3.7D anterior astigmatism at 25  (Figure 2B). Scheimpflug imaging shows a stable regularized anterior pattern within the 4.5mm central cornea with 2.3D astigmatism, inferiorly a mild steepening is present (Figures 2C, 3A and B).
Post-operative slit-lamp photography of anterior segment of the right eye with broad illumination (A) and with slit illumination from side view (B).
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Scheimpflug imaging shows a stable regularized anterior pattern within the 4.5mm central cornea with 2.3D astigmatism, inferiorly a mild steepening is present (Figures 2C, 3A and B).