Contact the manufacturer (like Alcon, Johnson & Johnson, or CooperVision). They can tell you exactly which new lens was designed to replace your old one.
Older lenses can become brittle or lose their oxygen permeability, which can cause corneal oxygen deprivation (hypoxia). 🛠️ The Professional Solution: Refitting
It is vital to understand the risks and regulations regarding discontinued medical devices:
Contact lenses have expiration dates. Using lenses past this date risks infection, as the saline solution's pH can change or the blister pack seal may fail, allowing bacteria to enter.
Smaller clinics may have "trial sets" or unsold boxes sitting in their backstock that aren't listed on a website.
If the discontinuation was recent, you might find "leftover" boxes at these types of outlets:
