Related Experiment Videos
[Fixation behavior in Stargardt disease. Fundus-controlled studies]
K Rohrschneider1, R Glück, A Blankenagel
1Universitäts-Augenklinik Heidelberg.
Summary
Patients with Stargardt's disease develop a typical pattern of fixation, progressing from unstable central fixation to constant eccentric fixation. This pattern helps explain reading difficulties and challenges in prescribing corrective devices for Stargardt's disease patients.
Area of Science:
- Ophthalmology
- Neuroscience
- Genetics
Context:
- Stargardt's disease is a common inherited retinal dystrophy.
- Patients often experience significant reading impairment despite relatively good visual acuity.
- The underlying mechanisms for reading difficulties remain incompletely understood.
Purpose:
- To investigate fixation patterns in Stargardt's disease using fundus perimetry.
- To correlate fixation behavior with reading difficulties in these patients.
- To understand the progression of fixation abnormalities.
Summary:
- Fundus perimetry and fixation tasks were performed on 40 eyes of 21 Stargardt's disease patients using a scanning laser ophthalmoscope.
- Observed fixation patterns included movement towards the scotoma, vertical orientation of fixation variation, and alternation between fixation points.
- Patients attempted to fixate targets within their central scotoma, indicating adaptive strategies.
Impact:
- Identified a three-step progression of fixation: unstable central, alternating central/eccentric, and constant eccentric fixation.
- The study provides a potential explanation for reading impairment in Stargardt's disease.
- Findings may aid in developing better strategies for visual rehabilitation and prescribing optical aids.