Medivena One-Care Opti Safety Lancets. ONE-CARE OPTI Push-Button Activated Safety Lancets offer excellent ergonomics with T-shape and transparent main housing, comfortable wings and oval button for stable grip within the hand and easier activation. ONE-CARE OPTI Safety Lancets have long and wide safety tab for convenient twist off and removal, optimized skin contact area of round shape, low trigger force as well as gentle and smooth activation mechanism for enhanced comfort of patients. Dual-spring mechanism allows for quick and seemless puncture. Automatic and reliable needle retraction helps protect against needlestick injuries and cross-contamination exposure. Built-in needle depth control provides for consistent and accurate sampling results.