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Quantitative phenotyping of chromatic dysfunction in best macular dystrophy
Sónia H Campos1, Vasco Forjaz, Lajos R Kozak
1Center for Ophthalmology, Institute of Biomedical Research in Light and Image, Faculty of Medicine, University of Coimbra, Az. de Sta Comba, Celas 3000-354, Coimbra, Portugal.
Archives of Ophthalmology (Chicago, Ill. : 1960)
|July 13, 2005
Summary
Chromatic discrimination is impaired in Best disease, even with good visual acuity (VA). This study found red-green deficits are only typical in late stages, challenging prior classifications.
Area of Science:
- Ophthalmology
- Vision Science
- Genetics
Background:
- Best disease is a hereditary macular dystrophy.
- Its impact on color vision is not fully understood.
- Current classifications of chromatic damage may be incomplete.
Purpose of the Study:
- To quantify color vision deficits in Best disease.
- To re-evaluate the traditional categorization of macular chromatic damage.
- To explore psychophysical and clinical correlations of vision changes.
Main Methods:
- Color-contrast discrimination was assessed using two psychophysical strategies.
- Tests included cone function and modified Cambridge Color Test.
- Visual acuity (VA) and chromatic discrimination variables were measured in patients and controls.
Main Results:
- Patients showed significant loss in all color axes, worsening with disease stage.
- Red-green deficits were only prevalent in stage 4, contradicting earlier assumptions.
- Chromatic dysfunction correlated with lesion size and, to a lesser extent, VA.
Conclusions:
- Color vision is frequently impaired in Best disease, even when VA is preserved.
- The study quantitatively demonstrates that red-green deficits are specific to late-stage disease (stage 4).
- This psychophysical approach refines the understanding of chromatic damage in Best disease.