A professional who tends machine that grinds approximate curves on lens blanks preparatory to fine grinding. Responsibilities include:

• Selects lens blanks as specified on production order.
• Places lens blank in holder and positions holder and lens assembly on diamond lap i of grinding machine.
• Lowers spindle of weighted arm onto lens holder to hold lens on lap.
• Starts machine and moves control arm back and forth to grind lens blanks to specified curvature or holds lens blank against grinding wheel to grind blank.
• Removes blank from holder and washes blank in water to remove grinding abrasive.
• Measures blanks to verify specified curvature, using lens gauge.