Related Experiment Video
Updated: May 2, 2026
07:45
Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
Published on: July 21, 2020
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Bitemporal hemianopia; its unique binocular complexities and a novel remedy
Eli Peli1, PremNandhini Satgunam
1Schepens Eye Research Institute, Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, USA.
Summary
Bitemporal hemianopia causes binocular vision issues. New aids like prisms and the stereo-typoscope can correct eye alignment and prevent double vision (diplopia) in patients.
Area of Science:
- Ophthalmology
- Neuroscience
- Vision Science
Background:
- Bitemporal hemianopic visual field defects often result in binocular vision problems.
- Patients with bitemporal hemianopia and pre-existing exophoria experience horizontal diplopia, potentially with vertical deviation.
- These symptoms arise from phoria decompensation into tropia (hemi-slide) due to absent retinal correspondence in nasal visual fields.
Observation:
- The study measured the effects of bitemporal hemianopia on binocular vision using a dichoptic perimeter.
- Observed that prism alignment can prevent diplopia in cases of incomplete bitemporal hemianopia.
Findings:
- Prism eye alignment successfully prevented diplopia in patients with incomplete bitemporal hemianopia.
- A novel fusion aid, the 'stereo-typoscope,' effectively prevented diplopia caused by hemi-sliding in complete bitemporal hemianopia.
- The stereo-typoscope utilizes midline stereopsis for effective diplopia management.
Implications:
- These findings offer new therapeutic strategies for managing binocular vision difficulties in patients with bitemporal hemianopia.
- Prism therapy and the stereo-typoscope represent valuable tools for ophthalmologists treating visual field defects.
- Further research into midline stereopsis may reveal additional applications for visual rehabilitation.
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