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>Functional aspects of blur adaptation in human vision. A study of the mechanism of blur adaptation in human vision - its origin and scope evidenced using subjective and objective procedures.
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Functional aspects of blur adaptation in human vision. A study of the mechanism of blur adaptation in human vision - its origin and scope evidenced using subjective and objective procedures.
Sensory adaptation to blur improves visual acuity under defocusedudconditions. This phenomenon has been successfully demonstrated usingudsubjective measures of acuity and is known as blur adaptation. This studyudinvestigates aspects of the mechanism of blur adaptation in human visionudusing subjective and objective methods.udParafoveal visual acuity measured under defocused conditions demonstratesudthat blur adaptation is not limited to the fovea. The presence of the adaptiveudmechanism in the parafovea also suggests that the neural compensation thatudtakes places under defocused conditions acts across a spatial range and isudnot limited to specific frequency bands. An evaluation of the contrastudsensitivity function under defocus provides further evidence.udElectrophysiological methods measure the effect of blur adaptation at theudretina and at the visual cortex to provide objective evidence for the presenceudof the blur adaptation mechanism. Finally enhanced-depth imaging opticaludcoherence tomography examines whether a period of prolonged defocusudtriggers any short-term changes in choroidal thickness in a similar manner toudthat reported in animal emmetropisation.
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