Preserflo Microshunt for Glaucoma

Glaucoma is a condition caused by increased pressure in the eye and is the leading cause of blindness. This increase in eye pressure damages the optic nerve resulting in vision loss. Glaucoma is particularly dangerous as it can go unnoticed for a long time until your vision starts to suffer as there are no early warning signs.

Eye drops and surgery to control the pressure can help to reduce the pressure but cannot restore vision that is already lost, however treatments can prevent and slow any further damage to the eye and optic nerve. It is very important to have regular eye checks to make sure your eye pressure is not raised.

What is Preserflo?

A Preserflo microshunt is a micro-tube which is inserted into the eye to lower pressure and reduce the need for eye drops or medication. The shunt is made of a synthetic material which is non-reactive and biocompatible called SIBS. It is not metallic so will not be affected by airport scanners, MRI machines or CT scanners.

The Preserflo cannot cure glaucoma, but it will reduce the eye pressure and prevent any further damage to the optic nerve and further vision loss.

How does Preserflo work?

Glaucoma is caused by pressure build up in the eye due to a blockage of the eye’s natural drainage system. This drainage system maintains pressure by allowing fluid to flow into and out of the eye. When blocked it means that more fluid remains in the eye than drains out, increasing the eye pressure. This pressure causes damage to the optic nerve and therefore vision. The Preserflo surgery, like traditional glaucoma surgery, recreates a drainage pathway for the fluid to leave the eye. However, Preserflo is a minimally invasive option.

Preserflo may be offered to you if you have been using pressure-lowering eye drops or tried laser (or are not suitable for laser) and these are no longer working for you.

During the procedure

During the procedure your eye will be numbed with eye drops and local anaesthetic around the eye so you will not be able to feel anything but you will be awake. The surgeon will then insert the micro tube into your eye through a tiny incision. The whole procedure should take no longer than 30-40 minutes.

Following the procedure you can return home within a couple of hours but won’t be able to drive straight away. Your surgeon will give you some healing eye drops to use.


We recommend avoiding rubbing or pressing on the eye after surgery. Your surgeon will advise when you are able to drive again but reading, watching TV and computer use is fine after the procedure. It is safe to fly post-procedure but be mindful that your surgeon will want to see you a couple of times after surgery to check your progress. Make sure you wear goggles if swimming whilst the eye heals.

This article is intended to inform and give insight but not treat, diagnose or replace the advice of a doctor. Always seek medical advice with any questions regarding a medical condition.