Age-related macular degeneration: choroidal ischaemia?

Area of Science:

• Ophthalmology
• Biomedical Ultrasound
• Medical Imaging

Background:

• Age-related macular degeneration (AMD) is a leading cause of vision loss.
• Choroidal microarchitecture changes may be linked to AMD pathogenesis, particularly ischemia.
• Non-invasive methods are needed to assess these microarchitectural differences.

Purpose of the Study:

• To utilize ultrasound to non-invasively detect choroidal microarchitecture differences.
• To investigate potential links between these differences and ischemia in normal eyes, dry AMD, and wet AMD.
• To differentiate between normal eyes and those with dry or wet AMD using ultrasound.

Main Methods:

• Prospective case series including subjects with dry AMD, wet AMD, and age-matched controls.
• 20 MHz B-scan radiofrequency ultrasound data of the macula were acquired and segmented.
• Wavelet transform and statistical modeling were applied to ultrasound signals, with ROC analysis for classification.

Main Results:

• The study analyzed 69 eyes (18 non-AMD, 23 dry AMD, 28 wet AMD).
• Multivariate models revealed statistically significant differences between the groups.
• Multiclass ROC analysis yielded a high volume-under-curve (0.892±0.17), suggesting classifier accuracy.

Conclusions:

• Wavelet-augmented ultrasound can differentiate choroidal microarchitecture in dry AMD, wet AMD, and normal eyes.
• Findings support an association between ischemia and dry AMD.
• This technology provides a basis for exploring pharmacological treatments to enhance choroidal perfusion in dry AMD.