Evaluation of Retinal Layers and Choroidal Structures Using Optical Coherence Tomography in Alopecia Areata

Area of Science:

• Ophthalmology
• Dermatology
• Immunology

Background:

• Alopecia areata (AA) is an autoimmune condition primarily affecting hair follicles.
• Emerging evidence suggests potential ocular manifestations in AA patients.
• Understanding these ocular changes is crucial for comprehensive patient management.

Purpose of the Study:

• To investigate ocular parameters in patients with alopecia areata (AA).
• Specifically evaluate the macula, retinal nerve fiber layer (RNFL), retinal layers, and choroidal thickness (CT) using spectral domain optical coherence tomography (SD-OCT).

Main Methods:

• A comparative study involving 42 AA patients and 42 age- and sex-matched controls.
• Ophthalmic examination and SD-OCT measurements were performed on the right eyes.
• Key parameters measured included central macular thickness (CMT), RNFL, various retinal layer thicknesses, and subfoveal, temporal, and nasal CT.

Main Results:

• No significant differences were found in CMT and RNFL between AA patients and controls.
• The thicknesses of individual retinal layers (GCL, IPL, INL, OPL, ONL, RPE, IRL, PRL) were comparable between groups.
• Choroidal thickness (CT) was significantly greater in the subfoveal, temporal, and nasal regions of AA patients compared to controls.

Conclusions:

• While retinal structures appear unaffected, AA is associated with increased choroidal thickness.
• This finding may indicate choroidal melanocyte inflammation or damage, similar to the autoimmune process in hair follicles.
• Further research is warranted to elucidate the mechanisms and clinical implications of choroidal changes in AA.