Jobs which involve working at a screen for at least 2 hours have to meet the requirements of the EU's VDU directive, see summary. Below please find the main points:
Workstations must be flexibly arranged. This means that tables and chairs must be adjustable in height and adjusted the employee's various functions / positions. Your thighs should be parallel to the chair seat and the entire sole of your foot should touch the floor.
The screen should be placed 50-70 cm from the eyes and the upper line of text should be about 15 cm below eye level. Choose a dark text on light background.
Work at a computer screen should be periodically interrupted by other work or breaks.
Employees are entitled to an eye test and to free screen spectacles if the eyetest shows that it is necessary.
There must be ample space beside the keyboard and mouse for documents. Moreover, there must be room for so you can rest your hands and arms on the tabletop. When using the mouse, your entire forearm should be supported by the worktop and your upper arm should be hanging down beside your body.
Your workstation should be positioned appropriately in relation to the lamps and daylight, so that reflections are avoided.
There is a wealth of information available about working at screens, working with mice, layout of office workplaces and repetitive work in both offices and laboratories. Ask your OSH (safety representative) if you need advice.
Safety representatives can also put you in contact with the university's physical therapist who can evaluate your workplace to give you some better ergonomic habits.