PURPOSE. To measure the density of cells in different layers of the cornea and to determine whether morphologic changes of the subbasal corneal nerve plexus are present in eyes with the pseudoexfoliation (PEX) syndrome. METHODS. Twenty-seven patients with unilateral PEX syndrome and 27 normal controls were investigated. All eyes underwent corneal sensitivity measurements with an esthesiometer and in vivo confocal microscopic study. Densities of the epithelial, stromal, and endothelial cells

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... measured. The density and tortuosity of the subbasal corneal nerve plexus were also evaluated. RESULTS. Eyes with PEX syndrome had significantly lower cell densities in the basal epithelium (P ϭ 0.003), anterior stroma (P ϭ 0.007), intermediate stroma (P ϭ 0.009), posterior stroma (P ϭ 0.012), and endothelium (P Ͻ 0.0001) than in the corresponding layers of normal eyes. PEX eyes also had lower subbasal nerve densities and greater tortuosity of the nerves than normal eyes. Fellow eyes of patients with PEX also had significantly lower densities of the basal epithelial and endothelial cells than the normal eyes. Corneal sensitivity was significantly decreased in PEX eyes, and this was significantly correlated with the decrease of basal epithelial cell and subbasal nerve densities. CONCLUSIONS. These results have shed light on understanding of the pathogenesis of decreased corneal sensitivity in eyes with PEX syndrome. PEX syndrome is probably a binocular condition for which keratopathy of the fellow eye also requires observation. (Invest Ophthalmol Vis Sci.