Choroidal structural evaluation in inactive Graves' ophthalmopathy

Area of Science:

• Ophthalmology
• Endocrinology
• Medical Imaging

Background:

• Graves ophthalmopathy (GO) is an autoimmune condition affecting the thyroid and eyes.
• Choroidal structure changes may occur in inactive GO, impacting visual health.
• Understanding these changes is crucial for managing GO patients.

Purpose of the Study:

• To investigate choroidal structure alterations in patients with inactive Graves ophthalmopathy.
• To compare choroidal vascularity index (CVI) and subfoveal choroidal thickness (SFCT) between GO patients and healthy controls.
• To evaluate the correlation of choroidal changes with clinical factors in GO.

Main Methods:

• Prospective, observational, cross-sectional study involving 56 inactive GO patients and 64 healthy controls.
• Enhanced depth imaging optical coherence tomography (EDI-OCT) used for binarization and analysis.
• Measurements included choroidal area, SFCT, stromal area, luminal area, CVI, and retinal nerve fiber layer (RNFL) thickness.

Main Results:

• GO patients exhibited significantly higher intraocular pressure and exophthalmometer readings than controls.
• Significant differences were found in SFCT, CVI (subfoveal), and stromal area (subfoveal) between groups.
• Age correlated negatively with SFCT, while disease duration correlated positively. Luminal and stromal areas negatively correlated with CVI.

Conclusions:

• Inactive Graves ophthalmopathy is associated with distinct choroidal structural changes, including altered CVI and SFCT.
• Age and disease duration are significant determinants of SFCT in GO.
• Choroidal CVI is influenced by luminal and stromal areas, highlighting the complex vascular remodeling in GO.