Novel quantitative assessment of metamorphopsia in maculopathy
| Autor: | Kameran Lashkari, Emily Wiecek, Steven C. Dakin, Peter J. Bex |
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| Rok vydání: | 2014 |
| Předmět: |
Male
Visual acuity genetic structures Microscopy Acoustic Vision Disorders Visual Acuity Risk Assessment Cellular and Molecular Neuroscience Macular Degeneration Risk Factors Medicine Humans Metamorphopsia Vision test Aged Monocular Amsler grid business.industry Incidence Vision Tests Articles Middle Aged Prognosis eye diseases Sensory Systems Visual field Ophthalmology Hyperacuity Massachusetts Fixation (visual) Optometry Female medicine.symptom Visual Fields business Tomography Optical Coherence |
| Zdroj: | Investigative ophthalmologyvisual science. 56(1) |
| ISSN: | 1552-5783 |
| Popis: | PURPOSE Patients with macular disease often report experiencing metamorphopsia (visual distortion). Although typically measured with Amsler charts, more quantitative assessments of perceived distortion are desirable to effectively monitor the presence, progression, and remediation of visual impairment. METHODS Participants with binocular (n = 33) and monocular (n = 50) maculopathy across seven disease groups, and control participants (n = 10) with no identifiable retinal disease completed a modified Amsler grid assessment (presented on a computer screen with eye tracking to ensure fixation compliance) and two novel assessments to measure metamorphopsia in the central 5° of visual field. A total of 81% (67/83) of participants completed a hyperacuity task where they aligned eight dots in the shape of a square, and 64% (32/50) of participants with monocular distortion completed a spatial alignment task using dichoptic stimuli. Ten controls completed all tasks. RESULTS Horizontal and vertical distortion magnitudes were calculated for each of the three assessments. Distortion magnitudes were significantly higher in patients than controls in all assessments. There was no significant difference in magnitude of distortion across different macular diseases. There were no significant correlations between overall magnitude of distortion among any of the three measures and no significant correlations in localized measures of distortion. CONCLUSIONS Three alternative quantifications of monocular spatial distortion in the central visual field generated uncorrelated estimates of visual distortion. It is therefore unlikely that metamorphopsia is caused solely by retinal displacement, but instead involves additional top-down information, knowledge about the scene, and perhaps, cortical reorganization. |
| Databáze: | OpenAIRE |
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