Answer
Constriction of the pupil reduces the light entering the eye, while contraction of the focusing muscle can temporarily alter focus.
Sources for this answer
- Minims Pilocarpine Nitrate 2% w/v, Eye drops solution — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.