XP stands for which binocular term?

Get ready for the NBEO Binocular Vision Test. Study with comprehensive materials and multiple-choice questions. Enhance your exam readiness with detailed explanations and practice questions to improve understanding and performance.

Multiple Choice

XP stands for which binocular term?

Explanation:
XP denotes an outward, latent misalignment of the eyes, called exophoria. The X signals outward deviation and the P indicates phoria—the tendency to drift that is kept in check by fusion and only reveals itself when binocular fusion is disrupted (for example, during dissociation). This differs from exotropia, which is a manifest outward deviation seen even when both eyes are used together. In contrast, esophoria and esotropia describe inward deviations, latent and manifest respectively. So XP is used for exophoria, not exotropia or the inward forms.

XP denotes an outward, latent misalignment of the eyes, called exophoria. The X signals outward deviation and the P indicates phoria—the tendency to drift that is kept in check by fusion and only reveals itself when binocular fusion is disrupted (for example, during dissociation). This differs from exotropia, which is a manifest outward deviation seen even when both eyes are used together. In contrast, esophoria and esotropia describe inward deviations, latent and manifest respectively. So XP is used for exophoria, not exotropia or the inward forms.

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