Carl Zeiss Microimaging Laser-TIRF (Total Internal Reflection Fluorescence) Imaging System is a component used in conjunction with Laser Scanning Microscopes, Non-Medical Devices for Research Use. The Laser-TIRF Imaging-System is a Class 3B laser system. The Laser TIRF Imaging System allows the visualization of substances or molecules being capable of fluorescing (excitable by light) by means of an electromagnetic (evanescent) field produced by total internal reflection.

Carl Zeiss MicroImaging LLC, through trained personnel, first visited each user site, provided additional user instructions, re-labeled the components to provide adequate instruction and warning and further placed a label over the access to the locking screw which secures the component to the microscope. Carl Zeiss Inc. issued "IMPORTANT LASER SAFETY NOTICE: URGENT: FIELD CORRECTIVE ACTION" notices to each user by express courier in late April 2011, Carl Zeiss personnel will confirm that the relabeling has been performed and updated instructions for use have been provided. For questions, please contact the company. The firm will implement 2 actions. Service Representatives will visit each user site, provide additional user instructions, relabel the components to provide adequate instruction and warning, and add a label over the access to the locking screw which secures the component to the microscope. Secondly, when new replacement sensors are available, Carl Zeiss field service technicians will perform the component replacements. Modified components are anticipated to be available within 6 months and replacement completed by April 2012.