In the context of the eye, PAS stands for Peripheral Anterior Synechiae. It describes a condition where the iris, the colored part of your eye, adheres or sticks to the angle of the eye. This is where the cornea (the clear front part of the eye) meets the iris.
Understanding Peripheral Anterior Synechiae (PAS)
Here's a breakdown of what PAS involves:
What happens?
- The iris physically attaches to the angle of the eye. This angle is crucial for draining fluid from the eye.
- When the iris adheres to this area, it can block the flow of fluid, increasing the pressure inside the eye.
Causes of PAS
PAS can develop due to several underlying conditions. Here are some of the main reasons:
| Cause | Description |
|---|---|
| Ocular Inflammation | Conditions like uveitis can cause inflammation leading to PAS. |
| Post-Traumatic | An eye injury can disrupt the normal anatomy and result in PAS. |
| Post-Cataract Surgery | Sometimes, PAS can occur as a complication after cataract surgery. |
| Iris Bombe | In pupillary block glaucoma, a condition called iris bombe, PAS can develop due to pressure changes. |
Why is it important?
- Glaucoma: The blockage of the drainage angle can lead to increased intraocular pressure (IOP), a significant risk factor for glaucoma.
- Vision Loss: If not treated, PAS can cause permanent vision damage.
How is PAS diagnosed?
- Gonioscopy: Doctors use a special lens to examine the angle of the eye and identify PAS.
Treatment options
- The primary goal is to address the underlying cause and relieve pressure in the eye.
- Medications like eye drops may help to control the intraocular pressure.
- In some cases, laser treatment or surgery may be needed to manage the problem and prevent vision loss.
Key takeaway: PAS occurs when the iris sticks to the angle of the eye, potentially blocking fluid drainage and increasing the risk of glaucoma. It's important to have regular eye exams to detect and treat any conditions that may lead to PAS.
