Answer
Yes. Latanoprost can gradually increase brown iris pigment, and the change may be permanent, especially in mixed-colour eyes.
Sources for this answer
- Roclanda 50 micrograms/ml + 200 micrograms/ml eye drops, solution — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.