When sourcing eye makeup, safety is the absolute priority due to the sensitivity of the ocular area. You must verify that products are ophthalmologist-tested and hypoallergenic. Key quality indicators include pigment density, blendability, and longevity (e.g., 12-hour wear). For liquid products like eyeliners or mascaras, ensure the formula is clump-free and smudge-proof. Always request a Certificate of Analysis (COA) and an MSDS (Material Safety Data Sheet) to confirm the absence of heavy metals like lead or mercury.