Who Needs Cataract Surgery: Candidacy, Other Eye Disease and Expectations
By Pauline Driscoll | Medically reviewed by Mr Lewis Pereira, FRCOphth
Published March 23, 2026 · Last reviewed April 3, 2026 · 3 min read
Key takeaways
- You are a candidate when a cataract affects daily life and glasses no longer help enough, not when the lens reaches a set thickness.
- Around 9 in 10 people achieve improved vision after surgery, assuming no other eye disease.
- Eyes with macular degeneration, glaucoma, diabetic retinopathy or amblyopia can have a good operation but limited final vision because of the other problem.
- Suitability and lens choice are decided at a proper eye assessment, not by preference alone.
- Honest expectations matter: surgery clears the cloudy lens, but it cannot fix damage further back in the eye.
You are a candidate for cataract surgery when a cataract is affecting your daily life and glasses no longer help enough, and around 9 in 10 people achieve improved vision afterwards, assuming no other eye disease1. Candidacy is about functional impact rather than a set cloudiness, and suitability is confirmed at a proper eye assessment rather than by preference alone2.
This question is one branch of cataract surgery as a whole, and once you know you are a candidate the next step is choosing a lens to match your eyes and lifestyle.
Who counts as a candidate
The core candidate is someone whose cataract affects daily life, such as driving, reading, work, hobbies or falls risk, and whose vision can no longer be corrected enough with glasses2. There is no fixed level of cloudiness that makes you eligible; the trigger is how much the cataract limits you3.
I spent two years blaming dim bulbs and small print before I accepted that my own sight had quietly clouded over. By the time headlights bloomed into smears on the evening drive, I was clearly a candidate, even though no appointment had ever named a magic number.
Other eye disease and the ceiling it sets
This is the honest part. Eyes with other conditions, such as macular degeneration, glaucoma, diabetic retinopathy or amblyopia, may have a good result from surgery but limited final vision because of the other problem1. Cataract surgery clears the cloudy lens at the front of the eye, but it cannot repair the retina or optic nerve further back.
What this means in practice is that the operation can still be worthwhile, brightening and clarifying what you see, while the final sharpness is capped by the other condition. A surgeon will explain the likely benefit honestly so you are not expecting more than the eye can deliver.
Age, general health and fitness for surgery
Age alone rarely rules anyone out. Cataract surgery is a day case, one eye at a time, usually under local anaesthetic with you awake, and the operation itself typically takes about 15 to 30 minutes4. What matters more than age is your general health and whether you can lie reasonably still and cooperate during the short procedure.
I was in my sixties and frightened of anyone going near my eyes, yet both operations turned out to be ordinary day cases. Being nervous did not make me unsuitable; it just meant I needed straight answers first.
Setting honest expectations
Most people notice clearer, brighter, less yellow vision within days, with vision settling over a few weeks, and a final glasses check at around 4 to 6 weeks1. With a standard monofocal lens, most people still need glasses for reading, because the lens is set for one distance3.
I chose a monofocal lens, set for distance, and I still reach for readers for the newspaper. That was the trade I understood and accepted before surgery, and it is exactly what happened.
Where the decision is made
Suitability, lens choice and timing are decided at a proper eye assessment, not by preference alone2. You describe how your sight limits you; the surgeon examines your eyes, measures them for the lens, and explains the expected benefit against the small risks. The decision is shared, which is what made the difference for an anxious patient like me: I went in with questions and came out understanding what surgery could and could not do.
References
- Cataracts: diagnosis and treatment, American Academy of Ophthalmology. ↩
- Cataracts in adults: management (NG77), NICE. ↩
- Cataract surgery guidelines and patient information, Royal College of Ophthalmologists. ↩
- Cataract surgery overview, NHS. ↩
Common questions
Who is a good candidate for cataract surgery?
The clearest candidate is someone whose cataract is affecting daily life, for example driving, reading or work, and whose vision can no longer be helped enough by glasses. There is no fixed cloudiness threshold; the test is functional impact. Suitability for the operation itself is then confirmed at a proper eye assessment.
Can I have cataract surgery if I have macular degeneration or glaucoma?
Often yes, but the conversation is about expectations. Removing the cloudy lens can still brighten and clarify vision, but conditions like macular degeneration, glaucoma, diabetic retinopathy or a lazy eye can limit how good the final vision is, because they affect parts of the eye that surgery does not treat.
Is anyone too old for cataract surgery?
Age alone rarely rules out surgery. It is a short day-case operation, usually under local anaesthetic with you awake, so many older people tolerate it well. Your general health and your ability to lie reasonably still and cooperate matter more than your age.
How good will my vision be after surgery?
Around 9 in 10 people achieve improved vision afterwards, assuming no other eye disease. Most notice clearer, brighter, less yellow vision within days, settling over a few weeks. If the eye has another condition, the operation can still help but the final result may be capped by that other problem.
Will I still need glasses?
With a standard monofocal lens, most people still need glasses for some tasks, usually reading. The lens is set for one distance, commonly distance vision, so readers are often needed afterwards. Lens choice is part of the assessment and affects how much you depend on glasses.
Who decides whether I need the operation?
It is a shared decision. You describe how your sight limits you, and the surgeon assesses your eyes and explains the likely benefit and the small risks. Suitability and lens choice are decided together at the assessment, not by preference alone or by a number on a chart.
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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