Cataracts and Glaucoma: Combined Surgery, Eye Pressure, and Sequencing
By Pauline Driscoll | Medically reviewed by Mr Lewis Pereira, FRCOphth
Published April 7, 2026 · Last updatedMay 25, 2026 · Last reviewed May 28, 2026 · 3 min read
Key takeaways
- Cataracts and glaucoma often occur together, and cataract surgery can be done alone, or combined with a glaucoma procedure in one sitting.
- Cataract surgery itself can modestly lower eye pressure in many people, which can help glaucoma control.
- Glaucoma damage to the optic nerve is permanent, so a successful cataract operation restores clarity but cannot recover sight already lost to glaucoma.
- Combined cataract and glaucoma surgery aims to improve vision and control pressure together, but recovery can be slower and vision settles over longer.
- Sequencing is a shared decision based on how advanced each condition is, the eye pressure, and how much the cataract limits daily life.
Cataracts and glaucoma often turn up in the same eye, and cataract surgery can be done on its own or combined with a glaucoma procedure; removing the lens can even lower eye pressure a little, but a clear new lens cannot recover sight already lost to glaucoma1. The two conditions are managed together with care, because each affects how the other is treated and timed.
Glaucoma is one of the other eye conditions that can leave a good operation with limited final vision, alongside macular degeneration and diabetic retinopathy. It is worth reading this with cataract surgery and cataract surgery risks and complications in mind, because the glaucoma changes both the plan and the expectations.
Why the two so often go together
Both cataracts and glaucoma become more common with age, so it is no surprise they frequently share an eye. Cataracts are mostly age-related and very common, the leading cause of reversible blindness worldwide1. Glaucoma, by contrast, damages the optic nerve, usually linked to raised pressure inside the eye, and the sight it takes does not come back.
That difference matters. The cataract is the reversible problem; the glaucoma damage is the permanent one. Understanding which part of your blurred or narrowing vision belongs to which condition is the first step the assessment tries to sort out.
How cataract surgery affects eye pressure
Cataract surgery can modestly lower eye pressure in many people, because swapping the bulky natural lens for a thin artificial one opens space inside the eye2. For someone with glaucoma this can be a welcome side effect that helps pressure control, though the size of the effect varies from eye to eye and is never guaranteed.
This is one reason surgeons sometimes time a cataract operation with the glaucoma in mind. It does not replace glaucoma treatment, but it can be a useful nudge in the right direction for the pressure.
Combined surgery, or one at a time
Sometimes the cataract and the glaucoma are treated in a single combined operation, aiming to improve vision and control pressure together3. Other times the cataract is removed first and the glaucoma managed separately. Combined surgery can mean slower recovery and vision that settles over longer than a routine cataract operation, where most people notice clearer, brighter vision within days and the eye settles over a few weeks.
The choice is individual. A person whose glaucoma also needs intervention may do well with a combined approach; someone whose glaucoma is stable on drops may simply have the cataract removed. Either way, eye pressure is watched closely afterwards.
What stays lost, and what comes back
The honest part is worth stating plainly: glaucoma damage to the optic nerve is permanent, so a successful cataract operation restores the clarity the cataract took away but cannot recover sight already lost to glaucoma1. Around 9 in 10 people achieve improved vision after cataract surgery, but that figure assumes no other eye disease. With glaucoma, the result can be a good operation and still a limited field of vision.
I met a man in a waiting room who put it perfectly. He said he had stopped expecting the operation to give him back the edges of his sight that glaucoma had quietly eaten, and instead hoped only for the middle to be brighter and less foggy. When it was, he was thrilled, precisely because he had not been promised more than the cataract could deliver.
Sequencing as a shared decision
There is no fixed level of cloudiness that triggers cataract surgery, and with glaucoma in the picture the timing weighs even more factors4. How advanced the glaucoma is, what the eye pressure is doing, and how much the cataract limits daily life all feed into a shared decision with the surgeon.
For the wider question of timing, see when to have cataract surgery, and for what the work-up involves, the cataract assessment. The presence of glaucoma does not rule cataract surgery out; it simply means the plan is built around both conditions at once.
References
- What is glaucoma?, American Academy of Ophthalmology. ↩
- Cataracts in adults: management (NG77), NICE. ↩
- Cataract surgery guidelines and patient information, Royal College of Ophthalmologists. ↩
- Cataract surgery, NHS. ↩
Common questions
Can you have cataract surgery if you have glaucoma?
Yes. Many people have both conditions, and cataract surgery can be carried out safely alongside glaucoma. It can be done on its own, or combined with a glaucoma procedure in a single operation. The plan depends on how advanced the glaucoma is, what your eye pressure is doing, and how much the cataract is limiting your sight. It is a shared decision with the surgeon.
Does cataract surgery lower eye pressure?
It can. Removing the natural lens and replacing it with a thin artificial lens opens up space inside the eye, and in many people this modestly lowers eye pressure. For some with glaucoma this is a helpful side effect that can ease pressure control. The effect varies between eyes, so it is not guaranteed, but it is one reason cataract surgery is sometimes timed with glaucoma in mind.
Should cataract and glaucoma surgery be done at the same time?
Sometimes. Combined surgery treats both in one sitting, aiming to improve vision and control pressure together, which can suit people whose glaucoma also needs intervention. Other times it is better to do the cataract first and manage the glaucoma separately. Recovery from combined surgery can be slower and the vision settles over longer, so the choice is individual.
Will cataract surgery restore vision lost to glaucoma?
No. Glaucoma damages the optic nerve, and that damage is permanent. Cataract surgery removes the cloudy lens and restores the clarity the cataract took away, but it cannot recover sight already lost to glaucoma. This is an important expectation: the operation can make a real difference to the cataract part of your vision while leaving the glaucoma-related loss unchanged.
Is recovery different after combined cataract and glaucoma surgery?
It can be. A combined operation involves more than a standard cataract removal, so the eye may take longer to settle and the vision can fluctuate more in the early weeks. Eye pressure is watched closely afterwards, and the drops schedule may differ from a routine cataract recovery. Your surgeon will explain the specific aftercare for the procedure you have.
How is the order of operations decided?
Sequencing is a shared decision. The surgeon weighs how advanced the glaucoma is, what the eye pressure is doing, and how much the cataract limits daily life such as driving and reading. In some eyes the cataract comes first; in others a combined procedure makes sense. There is no single rule, which is why a proper eye assessment guides the plan.
Written by Pauline Driscoll. Medically reviewed by Mr Lewis Pereira, FRCOphth.
Our guides are written from personal experience and reviewed by a qualified clinician for accuracy. Read our editorial policy.
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