Related Experiment Video
Updated: Jul 13, 2026
Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
Published on: April 14, 2014
[Perception Digital Test (PDT) for the assessment of incipient visual disorder in initial Alzheimer's disease]
1Unidad Memoria-Alzheimer, Servicio de Neurología, Institut Clínic de Neurociències IDIBAPS, Hospital Clínic i Universitari, Barcelona.
Introduction:
Visual perception disorders are frequent in degenerative diseases with posterior cerebral lobe involvement, such as Alzheimer's disease (AD). The main aim of this study is to create a Perception Digital Test (PDT) based on the treatment of digital photographs, and to present normative values in the elderly Spanish population. The second objective is to validate the test in a group of patients with mild AD, stage 4 in the Global Deterioration Scale (GDS) (AD-4).
Subjects:
The group were constituted by 86 healthy controls (CTR) and 27 AD patients.
Method:
VPT, which was formed by 15 items with four options of answer, was administered to all subjects.
Results:
Mean time of administration of PDT in CTR was 85 seconds (standard desviation: 33). Mean result obtained for each groups was significantly different (CTR: 13.5 [1.4]; AD-4: 10.6 (2.9); p = 0.05). Age did not significantly influence PDT performance in any of the groups. However, years of education influenced significantly the CTR group score.
Conclusion:
PDT is an easy, quick and sensitive test to assess visual perception disorders in initial AD.
