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Acquired vertical accommodative vergence
Ulrike Klein-Scharff1, Guntram Kommerell, Wolf A Lagrèze
1Universitäts-Augenklinik, Freiburg, Germany.
The Open Ophthalmology Journal
|May 30, 2009
Summary
Vertical accommodative vergence, a rare synkinesis, can be acquired, not just congenital. This finding suggests a developmental plasticity in the neural pathways controlling eye movements and focus.
Area of Science:
- Neuroscience
- Ophthalmology
- Developmental Biology
Background:
- Vertical accommodative vergence is an uncommon synkinesis linking vertical eye movements with focusing.
- It is believed to stem from aberrant neural connections in the brain's visual system.
- The origin, whether congenital or acquired, has remained undetermined.
Purpose of the Study:
- To investigate the developmental timeline and potential acquired nature of vertical accommodative vergence.
- To determine if this condition can manifest and develop during childhood.
Main Methods:
- Case study of a healthy young girl.
- Longitudinal observation of visual development between ages five and 13.
- Measurement of induced vertical vergence in response to accommodative changes.
Main Results:
- The patient gradually developed vertical accommodative vergence over an eight-year period.
- A 3-diopter change in accommodation elicited a 10-degree vertical vergence.
- This demonstrates that the underlying neural miswiring can be acquired during development.
Conclusions:
- Vertical accommodative vergence is not exclusively congenital and can be acquired during childhood.
- This finding highlights the brain's capacity for neural reorganization.
- The precise cause and mechanism of this acquired synkinesis require further investigation.
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