Fixation eye movement abnormalities and stereopsis recovery following strabismus repair

Fixation eye movement abnormalities and stereopsis recovery following strabismus repair

We evaluated the effects of strabismus repair on fixational eye movements (FEMs) and stereopsis recovery in patients with fusion maldevelopment nystagmus (FMN) and patients without nystagmus. Twenty-one patients with strabismus, twelve with FMN and nine without nystagmus, were tested before and afte...

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Bibliographic Details
Published in:Scientific reports Vol. 11; no. 1; pp. 14417 - 12
Main Authors: Martin, Talora L., Murray, Jordan, Garg, Kiran, Gallagher, Charles, Shaikh, Aasef G., Ghasia, Fatema F.
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 13-07-2021
Nature Publishing Group
Nature Portfolio
Subjects:
692/308/53
692/699/3161/3164
692/699/3161/3178
Adolescent
Adult
Binocular vision
Child
Child, Preschool
Depth Perception - physiology
Drift
Eye movements
Eye Movements - physiology
Female
Fixation, Ocular - physiology
Humanities and Social Sciences
Humans
Male
multidisciplinary
Nystagmus
Nystagmus, Pathologic - physiopathology
Nystagmus, Pathologic - surgery
Patients
Saccades - physiology
Saccadic eye movements
Science
Science (multidisciplinary)
Strabismus
Strabismus - physiopathology
Strabismus - surgery
Surgery
Vision, Binocular - physiology
Young Adult
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Summary:We evaluated the effects of strabismus repair on fixational eye movements (FEMs) and stereopsis recovery in patients with fusion maldevelopment nystagmus (FMN) and patients without nystagmus. Twenty-one patients with strabismus, twelve with FMN and nine without nystagmus, were tested before and after strabismus repair. Eye-movements were recorded during a gaze-holding task under monocular viewing conditions. Fast (fixational saccades and quick phases of nystagmus) and slow (inter-saccadic drifts and slow phases of nystagmus) FEMs and bivariate contour ellipse area (BCEA) were analyzed in the viewing and non-viewing eye. Strabismus repair improved the angle of strabismus in subjects with and without FMN, however patients without nystagmus were more likely to have improvement in stereoacuity. The fixational saccade amplitudes and intersaccadic drift velocities in both eyes decreased after strabismus repair in subjects without nystagmus. The slow phase velocities were higher in patients with FMN compared to inter-saccadic drifts in patients without nystagmus. There was no change in the BCEA after surgery in either group. In patients without nystagmus, the improvement of the binocular function (stereopsis), as well as decreased fixational saccade amplitude and intersaccadic drift velocity, could be due, at least partially, to central adaptive mechanisms rendered possible by surgical realignment of the eyes. The absence of improvement in patients with FMN post strabismus repair likely suggests the lack of such adaptive mechanisms in patients with early onset infantile strabismus. Assessment of fixation eye movement characteristics can be a useful tool to predict functional improvement post strabismus repair.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-021-93919-w