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Horizontal fusional amplitudes after adaptation to prism
Author(s) -
Stephens Gregory L.,
Jones Ronald
Publication year - 1990
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.1990.tb01101.x
Subject(s) - adaptation (eye) , prism adaptation , prism , amplitude , optometry , geodesy , optics , physics , geography , medicine
Horizontal fusional limits and lateral phorias were measured subjectively on five normal subjects after adaptation to increments of base‐in and base‐out prism. Both the phoria and the fusional limits were found to change by approximately the amount of the adapting prism. The fusional amplitudes (the difference between the phoria and the fusional limits) were relatively unaffected by vergence adaptation except at the largest values of adapting prism. These results are in agreement with current models of disparity vergence eye movement control which suggest that there are independent fast and slow fusional vergence mechanisms, each with its own saturation limit.