Is there a systematic location for the pseudo-fovea in patients with central scotoma?
The retinal location of preferential fixations of twenty-four patients with central scotoma were studied when reading digits projected onto their retina with a scanning laser ophthalmoscope. In the majority of cases the fixation was located on the left part, or the inferior part of the visual field relative to the central scotoma. The fact that the inferior visual field is used is coherent with the notion that the lower visual field is important for locomotion. However the preferential use of the left field appears contradictory with data showing superiority of visual faculties in the right visual field. This result may possibly be explained in relation to the need for left-to-right readers to monitor where their eyes have landed relative to the word previously fixated on the left.
Guez
J E
JE
Département Vision, Hôpital Lariboisière, Université Paris VII, France.
Le Gargasson
J F
JF
Rigaudiere
F
F
O'Regan
J K
JK
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005403:Fixation, Ocular / Q000502:physiology*; D005584:Fovea Centralis; D006801:Humans; D007834:Lasers; D008875:Middle Aged; D009887:Ophthalmoscopy / Q000379:methods; D011932:Reading; D012607:Scotoma / Q000503:physiopathology*; D014794:Visual Fields / Q000502:physiology*