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Quantitative visual fields under binocular viewing conditions in primary and consecutive divergent strabismus
M V Joosse1, H J Simonsz, E M van Minderhout
1Department of Ophthalmology, University Clinic Rotterdam, The Netherlands.
Summary
This study measured the full extent of suppression scotomas in divergent strabismus. Findings show suppression scotomas are common and their characteristics are not linked to strabismus type or angle.
Area of Science:
- Ophthalmology
- Neuroscience
- Visual Science
Background:
- Divergent strabismus is associated with suppression scotomas.
- Previous research focused on scotoma size, neglecting depth and full extent.
- The characteristics of suppression scotomas in divergent strabismus remain incompletely understood.
Purpose of the Study:
- To determine the full extent (size and depth) of suppression scotomas in patients with divergent strabismus.
- To investigate the relationship between scotoma characteristics and the type or angle of strabismus.
- To explore the critical age for the development of suppression in divergent squint.
Main Methods:
- Binocular static perimetry using modified Friedmann visual field analysers.
- Measurement of suppression scotomas in 15 patients with divergent strabismus (primary and consecutive) and 4 controls.
- Assessment of visual acuity and objective angle of squint.
Main Results:
- Normal monocular visual fields in all subjects.
- Large suppression areas found in 12/15 patients, covering fixation and foveal projections in the non-fixating eye.
- Suppression depth varied from 3 dB to 16 dB; nasal hemisuppression observed in two cases.
Conclusions:
- Scotoma shape is independent of divergent strabismus origin or angle.
- The critical age for suppression development in divergent squint may extend up to 14 years.
- Suppression scotomas are a significant feature in divergent strabismus, with implications for visual development.