Why would Panum's Fusional Area be asymmetrical?

[confusy]

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Hi all, I'm studying about depth perception and Panum's fusional area and am faced with a question as to why panum's area would be asymmetrical (for crossed and uncrossed disparities) or symmetrical for different individuals?
Can anyone help me out please? Thanks!!! 🙂

 

[ituryu]

Hi all, I'm studying about depth perception and Panum's fusional area and is faced with a question as to why panum's area would be asymmetrical (for crossed and uncrossed disparities) or symmetrical for different individuals?
Can anyone help me out please? Thanks!!! 🙂

Maybe due to an existing phoria that cannot be compensated for by the fusional reserve and thus there is no correspondence in the visual axes.

 

[ituryu]

Also it maybe due to eccentric fixation which occured due to an existing amblyopia-stabismus.