Verteporfin

Verteporfin (Visudyne®) is an injectable medication used to treat a type of vision loss known as age-related macular degeneration (AMD). AMD is the leading cause of vision loss in people over the age of 50 and is caused by the gradual deterioration of the central part of the retina known as the macula. AMD can cause central vision loss, making it difficult to see details or faces. Verteporfin works by blocking the growth of abnormal blood vessels in the eye, which are a hallmark of AMD. It is injected directly into the vein and a special laser light is used to activate it. This causes the abnormal blood vessels to close off and stop leaking, allowing the retina to heal. It is the only FDA approved drug specifically for the treatment of AMD.

Verteporfin is a medication used in conjunction with a specific light treatment to target certain eye diseases. Here's a breakdown of its role:

• Function: Verteporfin itself isn't directly therapeutic. It belongs to a class of drugs called photosensitizers. Once inside the body, it can be activated by a specific wavelength of light.
• Use: Verteporfin is used in a treatment called photodynamic therapy (PDT) for specific eye conditions. Here's how it works:
  1. Verteporfin is injected into a vein.
  2. After a short time, a special non-thermal laser light is directed at the affected area of the eye.
  3. The laser light activates the verteporfin specifically in abnormal blood vessels within the eye.
  4. Activated verteporfin disrupts the growth and function of these abnormal blood vessels, aiming to slow down or prevent vision loss.
• Target Conditions: PDT with verteporfin is used to treat the following eye conditions:
  • Age-related macular degeneration (wet AMD): Abnormal blood vessel growth under the macula (responsible for central vision) can lead to vision loss in wet AMD. PDT helps impede this abnormal growth.
  • Pathologic Myopia: This is an extreme form of nearsightedness where excessive eyeball elongation can cause abnormal blood vessel growth. PDT targets these vessels to potentially preserve vision.
  • Presumed Ocular Histoplasmosis Syndrome (POHS): This condition can involve abnormal blood vessel growth due to a past fungal infection in the eye. PDT can be used to manage these vessels.
• Important Considerations:
  • Verteporfin treatment can cause some side effects, including temporary vision changes, light sensitivity, and skin rash.
  • It's not a cure for the underlying eye disease, but aims to slow down vision loss.
  • The procedure requires careful monitoring by an ophthalmologist experienced in PDT.