Assist patients in selecting frames and lens options; perform accurate measurements (monocular/binocular PD, seg height/fitting height, OC placement, vertex distance, pantoscopic tilt, face form/wrap) to support optimal fit and vision. Fit, adjust, and repair eyewear (alignment, temple adjustments, nose pads, screws, minor parts replacement) and educate patients on wear, care, troubleshooting, and warranty.