Optical Coherence Tomography Angiography in Patients with Amblyopia

Area of Science:

• Ophthalmology
• Medical Imaging
• Retinal Vascular Diseases

Background:

• Amblyopia, or 'lazy eye,' is a developmental disorder affecting vision in one or both eyes.
• Optical coherence tomography angiography (OCTA) is a non-invasive imaging technique to visualize retinal vasculature.

Purpose of the Study:

• To compare OCTA parameters, specifically foveal avascular zone (FAZ) and vessel density (VD), between amblyopic eyes and control eyes.
• To investigate potential differences in retinal vascularization in amblyopic eyes.

Main Methods:

• A case-control study included 23 unilateral amblyopic eyes (cases) and 23 age- and sex-matched non-amblyopic eyes (external controls).
• The fellow sound eyes of amblyopic children served as internal controls.
• OCTA imaging was performed on all participants to measure FAZ and VD in superficial and deep capillary plexuses.

Main Results:

• Amblyopic eyes exhibited a significantly larger FAZ compared to their fellow sound eyes (P=.022).
• No significant differences in foveal, parafoveal, or perifoveal VD were found between amblyopic and non-amblyopic eyes.
• A lower deep whole vascular density was observed in amblyopic eyes compared to non-amblyopic eyes, suggesting reduced blood supply.

Conclusions:

• Amblyopic eyes demonstrate an enlarged FAZ and potentially reduced blood supply in the deep capillary plexus.
• OCTA parameters like FAZ and VD may offer insights into the structural and vascular changes associated with amblyopia.