IRCT2014121620337N1 IRCT 2015-06-22 Shiraz University of Medical Sciences Ergonomic design, development and evaluation of microscope workstation Ergonomic design, development and evaluation of microscope workstation to reduce musculoskeletal loads in users 2015-06-30 anticipated 12 Complete https://irct.ir/trial/18039 interventional Randomization: N/A, Blinding: Not blinded, Placebo: Not used, Assignment: Single, Purpose: Prevention. N/A Musculoskeletal disorders. At first typical workstation: using microscope on the typical workstation which is not adapted with user's anthropometric dimensions (in size and settings). Then new workstation: designed workstation which is adapted with user's anthropometric dimensions (in size and settings). The standard working time is an average of 1 minute and 15 seconds. Standard work is repeated 10 times. Each repeat includes a 3-minute rest period with relaxing the muscles of the upper limb, neck and shoulders. During the rest, if needed, the person is transferred to another table. The total duration of work on each workstation is 20 minutes..