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Minimally invasive glaucoma surgery (Xen implant) PDF Print E-mail
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Friday, 18 September 2015 16:50

Minimally invasive glaucoma surgery - "MIGS" - introducing the Xel Gel Stent implant surgery in Yorkshire

Simpler techniques for glaucoma surgery hold increasing promise for patients at risk of progressive disease. These newer micro-invasive operations are collectively know as "MIGS" and the "Xen implant" is one of these. Benefits include making traditional surgery simpler, with a single injection instead of several cuts and stitches, which makes the surgery faster to perform, quicker to recover from and safer. The implant itself is very small, only 6mm long, with an inside opening only 45 microns wide: in other words, that's around 1/10th of 1/2 a mm! (that is about the width of a human hair). The Xen design has improved on itself over the last few years with various iterations, down to this small diameter, which can be implanted in only a few seconds. Infact the actual surgery takes a few minutes longer than that, as mitomycin anti-scarring treatment (around 1 millilitre of 0.2mg/mL) is typically given in addition, to minimise the amount of surface tissue scarring. 

xen implant uk

Approximate size of Xen implant shown in yellow on a 3D model eye

The Xen implant is a soft material made from collagen (it is an animal-derived product), which is inert (non-reactive) and well-tolerated by the human body. To strengthen it, and make it more durable, the material is cross-linked synthetically (with glutaraldehyde) during its manufacture. Very occasionally (<1%), an implant may later need to be removed if a significant reaction develops. Post-operatively, after Xen implant surgery, some patients may need to revert back to some of their former drops again. Some studies show that at around 1 year after surgery, about 40-50% of patients do not need to use glaucoma medications at all. The Xen implant is recommended for standard primary open angle glaucoma, however studies are underway to look at its effectiveness in more advanced / refractory types of glaucoma (, AqueSys Xen 45 Glaucoma implant in Refractory Glaucoma). One advantage of the Xen implant is that it preserves the surface conjunctival tissue, therefore keeping it in reserve should other surgeries be required at a later stage. The Xen gel stent has a CE mark, and is approved for use in the EU. Patients are advised to consult their glaucoma specialist with regard to their individual suitability for the Xen implant.

More information is available on the manufacturer's website:

All surgeons on this site are trained in this procedure and please contact their secretary directly for more information, should you be interested in having this treatment yourself.

xen inserter

Xen surgeon 01

Xen implant for glaucoma

Xen surgeon 02

Last Updated on Monday, 21 September 2015 21:12
Home eye pressure measurement PDF Print E-mail
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Sunday, 21 October 2012 18:40

The iCare tonometer is an excellent tool for monitoring IOP (eye pressure) at home, however it requires careful instruction and supervision by an ophthalmologist for its use. The icare ONE tonometer is designed and recommended for home use by Glaucoma Patients who need regular IOP monitoring by their ophthalmologists recommendation. The tonometer works using a technique called rebound tonometry. No anaesthetic is required for its use.

icare tonometer

Last Updated on Sunday, 21 October 2012 18:49
What is glaucoma? PDF Print E-mail
Written by Administrator   
Sunday, 20 September 2015 00:00

All about glaucoma; symptoms, types and diagnosis of glaucoma

Glaucoma is a condition that leads to slow, but progressive loss of nerve fibres in the optic nerve. Many factors may increase the risk of this condition. If left untreated, this can lead to loss of peripheral vision (i.e. what can be seen at the sides of the visual field, rather than in the centre). In older people, glaucoma is one of the commonest causes of preventable blindness. If glaucoma progresses, it can affect all peripheral vision, then impair central vision, and -- very rarely -- may lead to very significant visual impairment. Treatments for glaucoma are aimed at bringing down the pressure in the eye to a level that is low enough to prevent harm to the optic nerve. Once the optic nerve is affected by glaucoma, lowering the pressure in the eye prevents further damage to the nerve. Damage already done to the optic nerve cannot be reversed. Screening for glaucoma is important from around age 40, every two years at least, unless you are in a higher risk group (eg Afro-caribbean race, or very strong family history of glaucoma).

Signs and symptoms of glaucoma

Symptoms of glaucoma are often absent in the early stages of the disease. Unfortunately, impaired vision is sometimes the first sign of glaucoma. Classically in angle closure glaucoma, symptoms and signs of glaucoma may include eye pain, cloudy vision, red eyes, headaches, and nausea.

How Is Glaucoma Diagnosed?

Frequent eye examinations are the best way to detect glaucoma. Your ophthalmologist will test the eye’s drainage angle, evaluate the optic nerve (ophthalmoscopy), measure eye pressure, and test the visual field of each eye (perimetry). The information from these examinations is compared at regular intervals to determine if glaucoma damage has progressed over time. Regular examinations play a critical role in the early detection of glaucoma.

Glaucoma Progression

Glaucoma typically initially affects side (peripheral) vision first. If left untreated, vision loss will continue, eventually resulting in total blindness. If glaucoma is identified early and treated appropriately, good eyesight can most likely be maintained.

Types of glaucoma.

There are several types of glaucoma, all of which affect the optic nerve. Open-angle glaucoma, the commonest form of the disease, develops when the angle between the cornea and the iris where fluid is supposed to drain from the eye is open, but the fluid drains out too slowly. Closed or narrow angle glaucoma occurs when the drainage angle is blocked by part of the iris and fluid cannot drain from the eye. Normal-tension glaucoma occurs in patients with normal intraocular pressure and is treated in the same way as open-angle glaucoma. Congenital glaucoma occurs when a child is born with a poor drainage outflow facility.

Treatment for glaucoma.

There are two main types of treatment for glaucoma: medication and surgery. Both of these treatments for glaucoma manage the disease by lowering the intraocular pressure. Medications and eye drops are common treatments, but there is the possibility of side effects, and they may eventually become ineffective over time. If the IOP cannot be managed by medications or eye drops alone, surgery or laser may be recommended. Your ophthalmologist will decide on your "target IOP" to help plan your treatment.

Recovery after Glaucoma Treatment

Glaucoma surgery is usually painless, although some patients may experience a slight stinging sensation following the procedure. Local anaesthetics are used to minimise any patient discomfort. After surgical treatments for glaucoma, it is possible to experience blurred vision or irritation. Typically, however, these effects are short-lived and normal activities, such as going to work or running errands, can be resumed after 2-3 days. This time period can be variable, it depends on the exact procedure performed.

optic disc

Last Updated on Sunday, 20 September 2015 10:11

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