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Research Article

Failure to detect bitemporal field defects due to chiasmal compression on a screening perimetry protocol

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Pages 357-361 | Published online: 08 Jul 2009
 

Abstract

Chiasmal compression can present with a bitemporal decrease of colour and contrast sensitivity. Here, we compare the results obtained by the Amsler grid, confrontation to show red desaturation, the Tinsley suprathreshold, and the Humphrey 24-2 protocol in a patient with a pituitary adenoma. The initial Amsler chart was positive. The suprathreshold protocol, used as a screening method in many centers, gave a false-negative result. We discuss this important practical point in relation to the different stimulus attributes.

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