Database	Search Approach	Principal Search Terms and Combinations Used
PubMed	Primary structured literature search	“vitamin D”; “retina”; “retinal”; “vascular”; “optical coherence tomography”; “optical coherence tomography angiography”; “OCT”; “OCTA”. Separate combinations included “vitamin D” AND “retina” AND “vascular”, “vitamin D” AND “optical coherence tomography”, and “vitamin D” AND “optical coherence tomography angiography”.
Scopus	Supplementary targeted search	Combinations of “vitamin D” with terms related to the retina or retinal/choroidal vascularization, including “retina”, “retinal”, “vascular”, “optical coherence tomography”, “optical coherence tomography angiography”, “OCT”, and “OCTA”. Searches were adapted according to the specific topic being investigated.
ScienceDirect	Supplementary targeted search	Combinations of “vitamin D” with terms related to the retina or retinal/choroidal vascularization, including “retina”, “retinal”, “vascular”, “optical coherence tomography”, “optical coherence tomography angiography”, “OCT”, and “OCTA”. Searches were adapted according to the specific topic being investigated.