Associated phoria in relation to stereopsis with random-dot stereograms.
In the present work, we use random-dot stereograms to test a possible relationship between associated phoria and stereopsis. We determined, using a modified constant-stimulus method, the disparity range that indicates the maximum range at which stereoscopic correspondence can be achieved. A total of 27 observers took part in the experiment. The value of the disparity range as a function of the associated phoria (measured with a Mallet unit) seems to indicate that greater associated phoria (fixation disparity) correlates with a deterioration in stereoscopic vision, reducing the disparity range and therefore the space region in which stereoscopic vision can be attained.
Jiménez
J R
JR
Departamento de Optica, Facultad de Ciencias, Universidad de Granada, Spain. jrjimene@goliat.ugr.es
Olivares
J L
JL
Pérez-Ocón
F
F
del Barco
L J
LJ
D000328:Adult; D003867:Depth Perception / Q000502:physiology*; D005133:Eye Movements; D005403:Fixation, Ocular / Q000502:physiology; D006801:Humans; D015588:Observer Variation; D013285:Strabismus / Q000503:physiopathology*; D015357:Vision Disparity / Q000502:physiology*; D015348:Vision, Binocular / Q000502:physiology