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May 26, 2005
Pachymetric evaluation prior to laser in situ keratomileusis
JCRS Volume 31, Issue 4, Pages 701-706 (April 2005)
To determine whether deviations in the localization of the cornea's thinnest point or the magnitude and localization of posterior corneal ectasia is associated with deviations in the spherical equivalent, the astigmatism, or the magnitude of an anterior corneal ectasia and whether corneas at risk for iatrogenic keratectasia can be identified without a pachymetry map of the cornea.
volunteers with various refractive errors were examined with Orbscan II and The corneal thickness was registered at the fixation point, at the geometrical center, and at the thinnest point of the cornea.
Results
The thinnest point of the cornea was predominantly located in the inferotemporal quadrant, and was significantly thinner than the fixation point (539.6 ± 35.8 μm and 548.0 ± 35.4 μm, respectively, P<.001). Conclusions
The absence of a clear relationship between the shape of the anterior corneal surface or the refractive error, and the shape of the posterior corneal surface, necessitates a thorough pachymetric evaluation of the cornea before LASIK,with special attention to the inferotemporal area.
Posted by alireza habibollahi at May 26, 2005 07:37 AM