Several clinical conditions cause increased pre- attentive visual search (PAVS) times, implying reduced parallel search capabilities in DLB dementia and Parkinsons disease. This book describes the effect of a number of variables on PAVS performance including optical blur, age, retinal eccentricity and perceptual learning, and critically establishes that the test remains viable in the presence of such potentially confounding variables. importantly, it also describes the efficiency of PAVS in cases of established glaucoma; glaucoma suspects and age- matched normals, determines the...