the effect of magnification lenses on reducing musculoskeletal discomfort among dentists

background: work-related musculoskeletal disorders are the most important problems in the health workforce. these discomforts cause many working days losses, increase absenteeism from work, and impose annual economic costs. awkward posture is the most important factor among the risk factors for work-related musculoskeletal disorders. this study aimed at implementing an interventional ergonomic program to minimize musculoskeletal disorder among dentists.   methods: this semi- experimental study was conducted on 75 dentists of milad hospital using a census method. the nordic questionnaire was used to determine the prevalence of musculoskeletal disorders. in this study, the intervention was to apply optical magnification lens whose impact on reducing musculoskeletal disorder had been previously investigated. corlett and bishop scale was used to evaluate musculoskeletal disorders before and after the intervention. paired t-test was conducted to compare the discomfort intensity before and after the intervention   results: the results revealed that the prevalence of musculoskeletal disorders in neck, back, shoulder, and arm were higher than other areas of the body in dentists. there was a significant difference in discomfort intensity of the neck, shoulder, arm, back, elbow, forearm, and the whole body after the ergonomic intervention (p<0.05). surveys on improving working conditions using the magnification lens revealed that more than 89% of the individuals expressed that the use of the lens increased the ease while working.   conclusion: the present study revealed that the use of optical magnification loupes, because of providing a suitable posture while working, could reduce musculoskeletal disorders in different areas of the body. thus, we can predict that the prevalence of musculoskeletal disorders will be reduced in dentists in a long run if they use optical magnification loupes.