iStent
iStent is an advanced Minimally Invasive Glaucoma Surgery to reduce eye pressure safely with iStent; a tiny implant designed to improve fluid drainage and preserve vision, often performed at the time of cataract surgery.
FDA Approved
Advanced Technology
iStent at a Glance
iStent is a minimally invasive glaucoma implant that enhances natural fluid outflow to help lower intraocular pressure (IOP), one of the key factors in glaucoma progression.
- Treatment Offered
iStent implantation (MIGS)
- Finance
Transparent pricing with full aftercare support; finance options discussed during consultation
- Why Choose
Specialist glaucoma and cataract surgeons with access to advanced diagnostics
- Locations
London, Surrey, Sussex
Key Benefits
- Minimally invasive implant with a small incision
- Effective IOP reduction with a favorable safety profile
- Optionally performed with cataract surgery
- Reduces reliance on glaucoma eye drops
- Shorter recovery than traditional glaucoma surgery
- Consultant-led care with structured follow-up
What is iStent?
iStent is a tiny glaucoma implant, one of the smallest medical devices used in modern surgery, designed to improve the eye’s natural drainage of aqueous fluid. In glaucoma, the eye’s drainage channels can become inefficient, causing fluid build-up and increased pressure. iStent creates a permanent micro-bypass through the trabecular meshwork, enhancing fluid outflow and helping to lower intraocular pressure.
iStent is typically implanted at the same time as cataract surgery through the same tiny incision. The device is positioned in Schlemm’s canal, allowing fluid to bypass resistance in the drainage system and flow more freely. This helps reduce pressure over the long term, protecting the optic nerve and slowing glaucoma progression.
At Centre for Sight, iStent is performed by consultant ophthalmologists with specialised expertise in glaucoma and cataract surgery, ensuring safe, predictable outcomes tailored to your individual case.
Types of MIGS Performed at Centre for Sight
1
iStent / iStent inject
A microscopic implant placed into the eye’s natural drainage channel (Schlemm’s canal) to improve fluid outflow and lower eye pressure. Commonly performed alongside cataract surgery in patients with mild to moderate open-angle glaucoma.
2
A flexible, scaffold-like implant inserted into Schlemm’s canal that both bypasses resistance and gently dilates the natural drainage pathway. Hydrus is designed to provide more extensive coverage of the canal than a single stent and is often chosen for patients who require greater pressure reduction at the time of cataract surgery.
3
A laser-based MIGS procedure that creates precise micro-channels in the trabecular meshwork to enhance aqueous outflow. ELIOS requires no implants and preserves the eye’s natural anatomy, making it an attractive option for patients undergoing cataract surgery.
4
While not implant-based MIGS, selective laser trabeculoplasty (SLT) and direct SLT (DSLT) are often used alongside or prior to MIGS to reduce eye pressure non-invasively by improving trabecular meshwork function.
Comparing MIGS and Glaucoma Treatment Options
Please note that your consultant will recommend the most suitable treatment option tailored to your eye health, vision goals and lifestyle.
Procedure Type
How it works
Best For
Pros
Cons
Procedure Type
iStent/iStent Inject
How it works
Micro-bypass stent improves trabecular outflow via Schlemm’s canal
Best For
Mild–moderate open-angle glaucoma with cataract
Pros
Proven safety profile; reduces drop burden; quick recovery
Cons
Pressure reduction may be modest in some patients
Procedure Type
Hydrus Microstent
How it works
Scaffold dilates and supports Schlemm’s canal while bypassing resistance
Best For
Mild–moderate glaucoma needing greater pressure reduction
Pros
Broader canal coverage; effective IOP lowering
Cons
Implant-based; usually combined with cataract surgery
Procedure Type
SLT
How it works
Laser stimulates trabecular meshwork to improve drainage
Best For
Early glaucoma or ocular hypertension
Pros
Non-invasive; repeatable; no implants
Cons
Effect may diminish over time
Procedure Type
DSLT
How it works
Automated, non-contact laser treatment
Best For
Early or first-line glaucoma treatment
Pros
Comfortable; quick; no contact lens
Cons
Not suitable for all eye anatomies
What Are the Benefits & Risks of iStent?
Your surgeon will speak with you about the benefits and risks involved before your procedure.
Benefits of iStent:
Low-risk, minimally invasive implant
Improved IOP control with less medication
Can be combined with cataract surgery
Rapid visual recovery
Long-term device permanence
Risks/side effects (not exhaustive):
May not achieve pressure levels of more invasive surgery
Some patients continue to require drops
Rare risks: transient inflammation, stent positioning issues, need for additional treatment
Not Sure If You're Eligible?
Book a comprehensive eye examination to better understand your vision and available treatment options.
Who Is Suitable for iStent?
Your surgeon will speak with you about your suitability prior to carrying out the procedure.
iStent may be suitable if you:
Have mild to moderate open-angle glaucoma
Are undergoing or have cataract surgery
Want to reduce reliance on glaucoma medications
Need better pressure control with a favourable safety profile
Have suitable eye anatomy confirmed by diagnostics
Suitability is assessed through comprehensive glaucoma evaluation, including IOP measurement, optic nerve imaging and angle assessment.
Costs and Finance Options
Centre for Sight offers transparent, fixed pricing for iStent including consultant-led surgery, laser-assisted precision, anaesthetic care, and comprehensive aftercare.Consultation: from £465 (This covers specialist assessment and advanced diagnostics and is required before treatment.)
Additional Procedures
ELIOS Laser Vision
Bespoke Price
Per Eye
Consultant-led combined cataract and glaucoma treatment
Excimer laser–assisted micro-channels to improve fluid drainage
No implants or permanent devices
Preserves natural eye anatomy
24-hour emergency support
Structured post-operative follow-up
iStent
Bespoke Price
Per Eye
Consultant-led glaucoma surgery
iStent / iStent inject implant
Advanced diagnostics and surgical planning
Often performed with cataract surgery
24-hour emergency support
Structured one-year follow-up
SLT and DSLT
Bespoke Price
Per Eye
Consultant-led glaucoma laser treatment
Clinically proven pressure-lowering laser
Outpatient, non-invasive procedure
May reduce or replace glaucoma eye drops
24-hour emergency support
Post-treatment monitoring and follow-up included
Flexible Finance Options
Private Medical Insurance
Many of our Consultants work with all the major insurance providers*
Self Pay
Pay in full for patients who prefer a straightforward approach
0% APR Financing
6-24 month finance options. Credit is provided subject to affordability, age and status. Minimum spend applies.
Military Discount
5% discount for active military and veterans
*Private Medical Insurance is unlikely to cover Laser Eye Surgery Procedures, Implantable Contact Lenses, or Laser Lens Replacement
*Private Medical Insurance is unlikely to cover Laser Eye Surgery Procedures, Implantable Contact Lenses, Laser Lens Replacement or any other cosmetic procedures.
FAQs
Below you will find answers to some of the most common questions patients ask about iStent, to help you understand your options and what to expect.
What is iStent used for?
iStent is used to lower eye pressure in open-angle glaucoma, often combined with cataract surgery.
Is iStent painful?
No — the procedure is performed under local anaesthetic with minimal discomfort.
Will I still need eye drops after iStent?
Many patients reduce or stop glaucoma drops, but some may still need medication.
Is iStent suitable for advanced glaucoma?
iStent is usually best for mild to moderate glaucoma. More advanced cases may need traditional surgery.
Have Questions?
Our patient care team is here to answer any questions you may have.
Patient Success Stories
Absolutely exceptional
From my initial consultation on 30th September to my follow up appointment on 28th October having had cataract surgery and multi focal lenses inserted in both eyes I have received exceptional care, kindness and professionalism. The entire procedure has far exceeded my expectations and absolutely everyone in the team have been incredible. I was made to feel special every step of the way which was painless and totally comfortable. I can wholeheartedly recommend Centre For Sight at East Grinstead.
Cataract
Jan McKinnell
A friend recommended Centre for Sight.
I had two cataracts removed and am delighted with the outcome. All the staff were highly professional, took meticulous care and their work was exemplary. Particular thanks to Adora who was so kind and reassuring throughout. I highly recommend Centre for Sight for anyone considering treatment.
Eventually I went to Specsavers in Egham for some mild driving glasses and the optician looked into my eyes and said that he had never seen such a good job on lens replacements. Best he had ever seen.
Cataract
Florence Angell
As I write this – five days after the first eye was done, I can see clearly! I’m hoping for further improvement as the coming weeks pass.
Overall, the team are extremely professional, all led under the leadership and expertise of Mr Daya. He only has one objective – to make your vision better. And that he has achieved.
Thank you so much.
Best wishes,
Nick
Cataract
MCALEER /NICHOLAS MR
Cataract Surgery Performed Expertly.
Cataract surgery performed expertly by Mr Sheraz M Daya on both eyes. Trifocal lense implants in one procedure and I am now glasses free with better than perfect vision. From start to finish the attention to detail, friendly professionalism and expertise of everyone at Centre For Sight was outstanding.
I cannot praise Mr Daya and his team too highly, and would recommend the procedure to anyone. It truly can be life changing.
Many thanks to everyone at Centre For Sight and in particular Mr Daya.
Cataract
Des Farrell
Videos
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The Power List 2026
Global Top 50: Mr. Sheraz Daya
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