Answer
Persistent blurring, altered colour vision, light sensitivity or missing areas of vision require prompt assessment. Temporary focusing difficulty can also occur near the start of treatment.
Sources for this answer
- Hydroxychloroquine sulfate 200mg FC tablets — 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.