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Cone Contrast and Entropy of Adaptive Optics Images in Choroideremia
Andrew M Huang1, Peiluo Xu2, Robert F Cooper3,4
1School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
Current Eye Research
|March 30, 2026
Summary
Choroideremia (CHM) patients show reduced cone contrast and entropy, indicating a decline in cone health. Texture analysis of cone images may serve as a biomarker for retinal diseases like CHM.
Area of Science:
- Ophthalmology
- Genetics
- Medical Imaging
Background:
- Choroideremia (CHM) is an X-linked inherited retinal degeneration.
- It leads to progressive loss of photoreceptors, retinal pigment epithelium, and choroid.
Purpose of the Study:
- To examine cone intensity contrast and entropy in CHM patients versus controls.
- To assess the utility of texture analysis as a biomarker for cone health in retinal diseases.
Main Methods:
- Used adaptive optics scanning light ophthalmoscopy (AOSLO) to image 13 CHM patients and 12 controls.
- Calculated cone contrast and entropy using gray level co-occurrence matrix (GLCM) analysis.
- Employed statistical analysis including ANOVA and Bonferroni post hoc tests.
Main Results:
- CHM patients exhibited decreased cone density and increased nearest neighbor distance compared to controls.
- Significantly lower cone contrast and entropy were observed in CHM patients at all eccentricities.
- Texture analysis revealed differences in cone mosaic and individual cone properties.
Conclusions:
- Cone contrast and entropy are reduced in CHM, suggesting impaired cone health.
- Texture analysis of cone images shows potential as a biomarker for retinal disease and treatment response.
- This method could aid in monitoring disease progression and therapeutic efficacy in CHM.
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