Occupational Optometry

I am working on a project based on Occupational Optometry in India and its impact on factories in protecting ocular problems and in preventing injuries. What is the impact of occupational optometry in its prevention of ocular hazards among factory workers & Its impact on productivity? Do you know of any previous work in this field?

I am looking for references on:
1) British Standards on Safety equipments (Ocular)
2) Factors to be considered in a work place for Hazard Recognition
3) Factors affecting productivity and factors to be considered in Measuring or estimating the productivity of a factory worker.