When is the right time to have cataract surgery? A consultant ophthalmologist’s view
- The advice to “wait until it’s more advanced”, or that it’s “not bad enough yet” is outdated.
- The right time for surgery is when your vision is interfering with your daily activities or lifestyle and glasses can no longer correct it. Until that point, there is usually no need to have surgery..
One of the most common questions I get asked is: when should you actually have cataract surgery? Often patients have been told they should “wait until it’s more advanced”, or that their cataract is “not bad enough yet”. Both of these statements reflect an outdated understanding of the operation, and both can lead to patients waiting longer than they need to before regaining the vision they want.
Modern cataract surgery is one of the safest and most successful procedures in medicine, but the decision to have it is yours. The right time, in clinical terms, is when your vision is interfering with your daily activities or lifestyle to a degree that glasses can no longer correct. Until that point, there is usually no rush. Here is how I think about the question of timing, and how patients can think about it for themselves.
What a cataract actually is
The lens inside your eye sits behind the iris (the coloured part of the eye) and focuses light onto the retina (the light-sensitive layer at the back of the eye). In a healthy young eye, the lens is clear, and the messages sent from the retina to the brain produce sharp vision. When a cataract develops, the lens becomes cloudy and prevents light from passing through normally. This is what causes the gradual blurring of vision, the glare around lights, and the multiple-image effect that many cataract patients describe.
Most cataracts are age-related and so represent the normal ageing of the eye, in the same way that grey hair is part of the normal ageing of the body. Certain factors – long-term UV exposure, smoking, diabetes, and prolonged use of certain medications – can accelerate their formation. But for most patients, cataracts are simply something the eye does over time.
The “wait until it’s bad enough” myth
The advice to “wait until it’s bad enough” is a hangover from a previous era of cataract surgery. Approximately thirty years ago, patients were told they had to wait for the cataract to be “ripe.” Before modern techniques became standard, cataract removal involved making a large incision in the eye and removing the lens in one piece. A process that was more straightforward when the cataract was dense. The guidance to wait reflected the limits of the technique, not the limits of the eye.
Modern cataract surgery uses a technique called phacoemulsification, often shortened to “phaco”. This involves making a very small incision, softening the lens using ultrasound, and removing it through a fine probe. A clear artificial lens (intraocular lens implant, or IOL), made of a biocompatible plastic-like material, is then placed inside the eye through the same small incision. It is held in position by the back membrane of the original lens (the capsule). Unlike in the old technique, stitches are rarely needed.
This technique does not require the cataract to be “ripe”, and there is no clinical advantage to waiting until it is. The “ripeness” guidance has been outdated for at least twenty years.
Cataract Surgery Timing: When Does Surgery Actually Become Appropriate?
At first, you might not be aware that a cataract is developing and initially it may not cause problems with your vision. The clinical question is not “is it bad enough to need cataract surgery?” – it is whether your vision is being affected to the point that it is interfering with your daily activities or your lifestyle, even when you are wearing up-to-date glasses. That is the threshold at which surgery becomes a reasonable next step.
Importantly, the decision is yours. Cataract surgery is performed when you have a problem with your vision and you want to do something about it. It is not performed because a cataract is technically present, or because an optician has decided it is “time”.
For some patients, the threshold is reached relatively early. A professional driver, a sports player, an architect or anyone whose work requires sharp vision in variable lighting may notice the effects of a cataract long before a retired patient with less demanding visual needs. Glare, halos around lights at night, difficulty reading in low light, and reduced colour contrast are all common early symptoms that can be disruptive in some lifestyles and barely noticeable in others.
For other patients, the cataract progresses for years before it begins to affect daily life meaningfully. As long as glasses or contact lenses can correct your vision adequately for what you need to do, there is usually no need to consider surgery.
Signs your cataract may be affecting your daily life
There are some practical signs that can help you assess whether your cataract is reaching the threshold where surgery is worth discussing. Most patients notice some combination of the following:
- Glare from oncoming headlights when driving at night
- Halos around streetlights or other bright light sources
- Difficulty reading in low light, or needing brighter lighting to read comfortably
- Colours appearing duller or less vibrant than they used to
- Difficulty with activities you previously did comfortably, such as reading, watching television, or recognising faces at a distance
If your glasses are still correcting these issues to your satisfaction, surgery can wait. If they are not – particularly if you are noticing changes that affect your safety or your enjoyment of life – it is worth having a conversation with a specialist.
When there is no rush
The opposite case applies too. If your current glasses are correcting your vision well and you are happy with how you see, there is no medical reason to have cataract surgery. The procedure is very safe, but no surgery is entirely without risk, and the decision to operate should always be justified by a meaningful benefit.
It is also worth considering that modern cataract surgery is often an opportunity to choose the kind of vision you want for the rest of your life. Premium intraocular lenses – multifocal, extended depth of focus (EDoF), and toric lenses (which correct astigmatism) – can reduce dependence on glasses significantly. These options are typically only available through private surgery and require careful consideration. They are best discussed when the patient has had time to weigh the options properly, not under time pressure.
How I discuss cataract timing with patients
When a patient comes to me with a cataract, my first questions are about what problems, if any, do they have with their vision. What do they do for work? What are their hobbies? Do they drive at night? Do they have any issues reading? Have they noticed changes in their vision that are affecting any of these activities?
The answers to these questions usually tell me more about the right timing than the cataract itself. A patient whose cataracts are clinically mild but whose vision is interfering with their ability to do their job is a strong candidate for surgery. A patient with similar cataracts who reports no functional impact may be better served by another year of glasses and a review.
This is also the conversation in which we discuss intraocular lens options, which is a significant decision in its own right and one I will cover separately.
The bottom line
The time to have cataract surgery is when you have a problem with your vision, and you want to do something about it. If your vision is being well-corrected by your current glasses, there is no medical reason to operate. The right time, in other words, is not a fixed point. It is a conversation between you and your surgeon about what your vision needs to do, and how well it is currently doing it.
About Mr Alex Day
Mr Alex Day FRCOphth PhD CertLRS FWCRS is a Consultant Ophthalmic Surgeon at Moorfields Private, with decades of clinical experience in cataract surgery, laser vision correction, refractive lens exchange and Implantable Collamer Lens (ICL) surgery. The author of over 70 peer-reviewed publications, he is widely regarded as the surgeon of choice for medical practitioners and their families seeking vision correction in London.
