Final answer:
The nurse should emphasize avoiding bright indoor and outdoor light for at least 48 hours following verteporfin treatment, and to wear sunglasses when outdoors to reduce the risk of complications due to the photosensitivity of the medication.
Step-by-step explanation:
When a patient is being treated with verteporfin (Visudyne), it is critically important to manage light exposure after treatment due to the medication's photosensitivity effects. After administration of verteporfin, patients become highly sensitive to light, which can lead to complications. Therefore, they must protect their skin and eyes from direct sunlight and even from strong indoor light.
Among the options provided, the most important instruction to reduce the risk of complications would be to avoid indoor and outdoor light for a period following the treatment. Although not exactly for 5 days as stated in option 3, the actual recommended period is usually to avoid bright light for at least 48 hours after treatment. Wearing sunglasses when outdoors to protect their eyes from UV light is also critical, and patients should follow this precaution for at least several days, as sensitization could be long-lasting.