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Cont Lens Anterior Eye. 2015 Aug;38(4):294-7. doi: 10.1016/j.clae.2015.03.006. Epub 2015 Apr 10.

Scleral lens influence on corneal curvature and pachymetry in keratoconus patients.

Author information

1
Department of Ophthalmology, University Medical Center Utrecht, Utrecht, The Netherlands. Electronic address: N.Soeters@umcutrecht.nl.
2
Department of Ophthalmology, University Medical Center Utrecht, Utrecht, The Netherlands; Visser Contact Lens Practice, Nijmegen, The Netherlands.
3
Department of Ophthalmology, University Medical Center Utrecht, Utrecht, The Netherlands.
4
Zonnestraal Eye Hospital Amersfoort, Amersfoort, The Netherlands.

Abstract

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.

KEYWORDS:

Keratoconus; Keratometry; Pachymetry; Scleral lens; Topography

PMID:
25865408
DOI:
10.1016/j.clae.2015.03.006
[Indexed for MEDLINE]

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