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Vertical strabismus in monofixation syndrome
1Department of Ophthalmology Jules Stein Eye Institute, UCLA, Los Angeles, California 90095-7000, USA.
Summary
This study evaluates vertical deviation in monofixation syndrome (MFS). Hypertropia angles reached 6 PD, while dissociated vertical deviation (DVD) angles reached 14 PD in MFS patients.
Area of Science:
- Ophthalmology
- Strabismus
- Binocular Vision
Background:
- Monofixation syndrome (MFS) is characterized by a manifest horizontal deviation.
- Previous literature lacks data on vertical deviations associated with MFS.
- Understanding vertical deviations is crucial for comprehensive MFS assessment.
Purpose of the Study:
- To investigate and quantify the range of vertical deviation angles in patients with monofixation syndrome.
- To differentiate between hypertropia and dissociated vertical deviation (DVD) in MFS.
- To explore the relationship between MFS and vertical strabismus.
Main Methods:
- Forty patients with MFS and vertical strabismus were included.
- Patients were classified into three groups based on hypertropia and/or DVD.
- Vertical deviation angles were measured using simultaneous prism and cover test.
Main Results:
- Hypertropia was present in 45% of patients, with angles up to 6 PD.
- Dissociated vertical deviation (DVD) was present in 37.5% and combined in 17.5%.
- DVD angles ranged up to 14 PD, suggesting a potentially intermittent nature.
Conclusions:
- The angle of hypertropia in MFS can be up to 6 PD.
- Monofixation can be maintained with larger angles of DVD (up to 14 PD).
- The intermittent nature of DVD may explain its presence in MFS with larger deviations.