To explore an optimized scan technique for the detection of lid margin vasculature

To investigate whether the SS-OCTA tool has the potential to characterize the lid margin vascularity in MGD patients. The repeatability and validity of OCTA in assessing eyelid margin blood flow density was evaluated。

Inclusion Criteria:

The MGD patients were aged >_20 years and were diagnosed according to Chinese MGD diagnostic criteria,11 including dry eye symptoms, and at least one of the following signs: (1) poor meibum expressibility or quality; (2) at least one of eyelid margin abnormalities (lid margin irregularity, plugging of the gland orifice, vascular engorgement/telangiectasia, and anterior replacement of the mucocutaneous junction. Normal subjects were defined as adults without any dry eye symptoms and lid margin abnormality.

Exclusion Criteria:

(1) subjects with ocular diseases or conditions known to affect the anatomy of the anterior segment, such as acute ocular inflammation, a history of eyelid surgery, contact lens wear within two weeks, and/or eyelid trauma; (2) subjects with of history of systemic or topical medications that might cause ocular congestion; (3) subjects with severe systemic illness or pregnancy; and (4) subjects who were difficult to cooperate with examination, resulting the obtained images were not sufficiently clear for automatic analysis.

MGD or normal patients who could cooperate with dry eye evaluation and SSOCTA examination in the dry eye Clinic of the Eye Hospital of Wenzhou Medical University were enrolled.