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Ages and scores on vision function and reading measures for 60 subjects with absolute scotoma in visual field in Experiment 1.
Three studies using stabilized image techniques to produce a small, centrally located absolute scotoma found as much as a doubling of search time (Bertera, 1988; Hinton and Cooke, 1985; Murphy and Foley-Fisher, 1988).
The depth of the defect--an absolute loss compared with a relative loss can indicate the potential cause, for example cerebrovascular accidents give rise to an absolute scotoma
b) It shows an absolute scotoma in the superior field
There is total loss of function in the affected area, resulting in an absolute scotoma, but there is no threat to sight because, unlike a retinal detachment, a retinoschisis does not progress from the periphery towards the macula.