What is Phosphodiesterase type 5 inhibitors (PDE5i)?

Phosphodiesterase type 5 inhibitors, or PDE5i, help people who have trouble seeing clearly when they look at things far away.

Imagine your eyes are like a pair of binoculars that need to zoom in and out. When you're looking at something close, like a picture book, the binoculars adjust so you can see it better. But if you’re trying to see something far away, like a bird flying high up, the binoculars might not work as well, that’s when PDE5i comes in to help.

Think of your eyes as having little helpers called muscles. These muscles need a special signal to tell them to zoom out so you can see far away clearly. Sometimes, this signal is too weak or doesn’t last long enough. That's when PDE5i steps in like a super helper, it keeps the signal strong for longer, letting your eyes stay focused on distant things.

This is especially useful for people who need glasses to see far away but don’t want to wear them all the time. PDE5i gives their eyes a little boost, just like a toy car gets a quick push so it can zoom ahead!