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Scleral lens influence on corneal curvature and pachymetry in keratoconus patients
Nienke Soeters1, Esther Simone Visser2, Saskia M Imhof1
1Department of Ophthalmology, University Medical Center Utrecht, Utrecht, The Netherlands.
Objectives:
To investigate the influence of full scleral lenses on corneal curvature and pachymetry in keratoconus patients.
Methods:
In this intervention study, 20 eyes of 14 patients were measured by Scheimpflug imaging (Pentacam HR, Oculus) at two time points: directly and ≥1 week after scleral lens removal. Steep, flat and maximal keratometry (K(steep), K(flat) and K(max)) and optical pachymetry were analyzed. A generalized estimating equation analysis was performed to correct for paired eyes.
Results:
Directly after scleral lens removal, all three curvature parameters were significantly flatter compared to ≥1 week after scleral lens removal. Average K(steep) was 0.7 diopter (D) lower (P<0.001), average K(flat) was 0.5D lower (P=0.037) and average K(max) was 1.1D lower (P<0.001). Directly after scleral lens removal, average optical pachymetry was ±2.5% higher (P<0.001) compared to ≥1 week after scleral lens removal.
Conclusions:
Although scleral lenses do not mechanically touch the cornea, curvature and pachymetry seem to be influenced by scleral lens wear in keratoconus patients. The duration of these changes remain unclear.
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