Cataracts are very common. In fact, they’re the main cause of impaired vision worldwide. In England and Wales, it’s estimated that around 2.5 million people aged 65 or older have some degree of visual impairment caused by cataracts.

What are cataracts?

A cataract is a common eye condition in which the lens inside the eye loses its transparency. The lens is the part of the eye that helps to focus light on the retina, the light-sensitive layer on which images are formed. In healthy eyes, the lens is clear and allows light to pass through. When the lens is cloudy from a cataract, the images appear blurred, a bit like looking through a dirty window. Our expert Dr Nigel Best explains more below

Types of cataracts

There are three types of cataracts:

  1. Nuclear cataracts affect the centre of the lens and can make it difficult to distinguish colours
  2. Cortical cataracts affect the outer edge of the lens
  3. Posterior subcapsular cataracts form at the back of the lens. They interfere especially with reading and cause haloes to form around lights. This type of cataract tends to progress faster than the other types1.

What are the symptoms of cataracts?

  • Blurred, misty or cloudy vision
  • Bright lights may be dazzling or uncomfortable to look at
  • Colours may look faded or less clear with a yellow or brown tinge
  • You may find it more difficult to see in dim or very bright light
  • You may have double vision
  • You may see haloes (circles of light) around bright lights, such as car headlights or streetlights

Cataracts usually develop slowly over many years, so you may not notice symptoms at first. They often develop in both eyes, although each eye may be affected differently.

Cataracts are not painful and don’t make your eyes red or irritated. You’ll usually have blurred, cloudy or misty vision, or you may have small spots or patches where your vision is less clear.

What are the early signs of cataracts?

In most people, cataracts develop with age. As you grow older, the lens in the eye naturally becomes thicker, less transparent, and less flexible. Tissues in the lens can begin to break down and form clumps of protein that cloud small areas of the lens. Light cannot pass through these cloudy areas, which is why you may notice your vision becomes clouded or bleary.1 As the cataract continues to grow, the cloudiness becomes more noticeable and involves larger parts of the lens.

Besides cloudy, dim, or blurred vision, there can be other symptoms associated with a cataract. These include difficulty with night vision, haloes around lights, sensitivity to glare, fading of colours, and double vision on one side. People with cataracts may find they require brighter lights to read. Also, frequent changes in your glasses or contact lens prescription can indicate cataracts.1

Cloudy vision: how to tell if it's a sign of cataracts

You might have cloudy vision if objects in the distance seem ‘milky’, like you’re looking at them through a frosted window. This can affect your day-to-day life, making it difficult to do some normal activities. However, there are many causes of cloudy vision, including eye conditions like myopia, astigmatism and cataracts. But how do you know if this is the cause of your cloudy vision?

What causes cloudy vision?

Cloudy vision can take a toll on your lifestyle, often making it difficult to read, drive, or see faces clearly. Several eye conditions can cause this, including:2

  • Myopia (short-sightedness): objects at a distance appear blurry
  • Astigmatism: both near and far objects appear distorted and blurry
  • Presbyopia: age-related change in the ability to focus on near objects
  • Cataracts: cloudy vision due to changes in the lens of the eye affecting vision at all distances

There are also other less common causes of cloudy vision, including corneal abrasions (where the cornea becomes scratched), dry eyes, or scarring of the cornea (the clear part in front of the eye). On top of this, other causes can include optic neuritis, macular degeneration, diabetic retinopathy, infections and inflammation. If you’re experiencing a sudden deterioration in vision, you should seek immediate medical attention.

Why do cataracts cause cloudy vision?

The lens of the eye works like a camera to focus light on the retina and form images, adjusting to allow us to see objects at varying distances. Cataracts are made up of clumps of protein which cloud the lens – it’s a bit like cooking an egg white where the transparency gradually gives way to milky cloudiness. Usually, both eyes are affected, but vision may be better in one eye than the other.3

Cataracts mainly occur in older people, often developing as part of the natural ageing process. In fact, in the UK, cataracts account for more than one-third of the cases of vision impairment in people over the age of 75.4

Many cases of early-stage cataracts do not affect the eyesight substantially and you’d usually be unaware of any vision problems, which is why regular eye tests are so important to detect any changes. A common first symptom of early cataracts, however, is that night vision may not seem as good as it once was. As the cataract grows, more of the lens gets clouded and there may be more noticeable symptoms.

What causes cataracts?

Cataracts occur when cloudy patches develop in the clear lens inside your eye, stopping light from reaching the back of the eye, and causing blurred or misty vision. In most people, cataracts simply develop as they age, with most cases developing after the age of 65. But there are other factors that can increase your risk of developing cataracts, including:

  • A family history of cataracts
  • Regularly drinking excessive alcohol
  • Lifelong exposure of your eyes to UV light
  • Smoking
  • A poor diet lacking in vitamins
  • Taking steroid medication over a long time
  • Certain health conditions, such as diabetes

Cataracts and myopia

Short-sightedness, or myopia, is a very common eye condition that affects an estimated 1.4 billion people worldwide. In people who are myopic, light entering the eye does not focus onto the retina, making close objects appear sharp and well-defined, but objects at a distance appear blurred. As such, nearsightedness may not affect someone’s ability to read a book or look at a computer screen, but it makes it difficult to watch a film, read a whiteboard in a classroom, or see clearly when driving.5,6 While these symptoms can be easily managed with prescription glasses or contact lenses, undiagnosed nearsightedness can sometimes cause eye strain and headaches, or squints in children.

For most people, treating myopia is as simple as wearing prescription glasses or contact lenses to correct their vision. Research has found a link between people with high myopia and a greater risk of developing other eye conditions, including cataracts.7 In particular, one study found that cataracts are more likely in people who began using distance glasses before the age of 20, as well as in people over the age of 55 who develop nearsightedness.7, 8 While the precise link between high myopia and cataracts is not completely clear, it’s believed that severely myopic eyes have reduced levels of protective antioxidants, which could make them more prone to developing cataracts.Below we’ve outlined a few steps that can help to minimise the risk of developing cataracts:9

  • Quit smoking
  • Drink alcohol in moderation
  • Eat foods rich in antioxidants and vitamins, such as fruit and green leafy vegetables
  • Protect your eyes from UV damage by wearing high-quality sunglasses
  • If you are diabetic, keep your blood sugar under control

If you suspect that you may have cataracts, it’s best to make an appointment with a specialist. Regular eye exams make it possible to spot problems such as cataracts early on. For more information on cataracts, you can book an appointment with a Specsavers optometrist.

How are cataracts diagnosed?

Cataracts can usually be picked up during a normal eye test, which is why it’s important to have one regularly (once every two years or more frequently if your optometrist recommends it). During an eye exam, your optometrist will assess how well you can see at varying distances, as well as having a good look at your overall eye health. If they think you have cataracts, it’s likely that they will refer you to an eye specialist (ophthalmologist) who can confirm the diagnosis and plan your treatment.

What is the treatment for cataracts?

If your cataracts are mild, stronger glasses and brighter reading lights may be helpful for some time. However, most cataracts get worse over time (often many years) so it’s likely you will eventually need treatment. The only treatment that is proven to be effective for cataracts is surgery, which improves vision for most people.10 This will usually be recommended if your loss of vision is affecting your daily activities, such as driving or reading.

Cataract surgery

Cataract surgery is done under local anaesthetic, so you’ll be awake, but your ophthalmologist will make sure you don’t feel the area around your eye, and you can be sedated if you are particularly anxious. It’s a very common and successful procedure and involves taking out the cloudy lens and replacing it with a clear, artificial one. This artificial lens cannot cloud over in the same way, and so cataracts do not grow back after surgery.

There are two types of cataract surgery: small incision cataract surgery (phacoemulsification) and extracapsular cataract extraction. These surgeries are usually done on an outpatient basis, so you shouldn’t need to stay at the hospital overnight, and it usually takes less than an hour to perform.


During this type of cataract surgery, the surgeon inserts a tiny ultrasound probe into the eye through a small incision. The probe helps soften and break up the cloudy lens, which is then removed by suction. Once the surgeon has removed the cataract, they will insert an artificial lens (called an intraocular lens) which will allow light to pass through to your retina, restoring your vision.

Extracapsular cataract extraction 

In extracapsular cataract extraction (ECCE), the surgeon will make a slightly larger incision to remove the clouded lens. As before, once the clouded lens has been removed, a new, transparent, intraocular lens is positioned in the same place from where the natural one was removed.

The new lens is made of plastic, silicone, or acrylic and remains in the eye permanently. It cannot be seen or felt. It improves vision by focusing light clearly on the retina.11

How long does vision stay blurry after cataract surgery?

A common post-cataract-surgery effect is blurred vision, but depending on when and how long it happens, it can be a normal part of the recovery process.

Blurred vision after cataract surgery may last for a week or two, and this is nothing to worry about. Complete healing of the eye can take up to eight weeks.12 If you’ve had this procedure recently, watch out for symptoms such as eye swelling and redness, persistent pain, vision loss, flashes of light, or floaters in front of the eye. If these symptoms occur, contact your eye surgeon as soon as possible.12

However, if blurred vision persists or occurs after a length of time after surgery (for example, if you begin to experience blurred vision two years after cataract surgery), it can be a sign of posterior capsule opacification.

What is posterior capsule opacification?

During cataract surgery, the lens capsule (outer covering) is not removed. This membrane is left in place to support the lens implant. Posterior capsule opacification (PCO) is a condition in which where the lens capsule becomes cloudy and starts to affect your vision. PCO can develop months to years after the original procedure, and it can seem like the cataract is coming back.13

There is a fairly simple treatment for PCO called YAG laser capsulotomy. Doctors use a laser beam to make a small opening in the cloudy capsule which allows light to pass through. It is an outpatient procedure that takes less than five minutes to perform. It is painless and you can go home after a short period of observation. There should be a gradual improvement in vision over the next several days.13

Cataract surgery and macular degeneration

Cataracts can be easily treated with surgery, but there are some conflicting reports about the relationship between cataract surgery and age-related macular degeneration (AMD). The traditional view is that cataract surgery could increase the risk of AMD progressing. However, more recent studies have shown that patients with mild to moderate macular degeneration and moderately severe cataract can benefit from cataract surgery14.

Whether cataract surgery should be performed on an individual with AMD is a complicated decision. Your ophthalmologist will first need to find out which of the conditions is the primary cause of your vision worsening. In some people with advanced AMD, the retina may be damaged to such a degree that cataract surgery will not noticeably improve vision. In other people, cataract surgery can significantly improve vision and quality of life14.

Large multi-centre studies have shown there is no increased risk of progression to the advanced (wet) form of AMD in patients who undergo cataract surgery.15,16 Moreover, nutrients such as vitamin C, vitamin E, zinc, lutein, and zeaxanthin have been found to substantially reduce the risk of AMD progressing to advanced stages17.

Complications from cataract surgeries are rare. In patients with AMD, the clinical approach may simply need to be altered and some special precautions taken. There is usually no need to stop treatment for macular degeneration: anti-VEGF injections for AMD can continue in people who have, or who have not undergone cataract surgery18. These are injections that reduce the growth of new blood vessels beneath the macula.

Find out more about macular degeneration

What can I expect after my cataract surgery?

Most people can go home on the same day as their cataract surgery. The surgeon may place a protective shield or pad over your eye, which should be kept in place for a day or as instructed. Within a few hours of the procedure, you should start to have a return of feeling in your eye as the anaesthesia wears off, although it can take a few days for your vision to fully return.

It is normal to have mild discomfort, temporary fluid discharge and sensitivity to light after cataract surgery, alongside side effects such as grittiness, double vision, blurred vision, or a bloodshot eye for the first few days. These symptoms are a completely normal part of cataract surgery recovery, although it’s worth making your surgeon aware if you do experience them.20

As part of your cataract surgery aftercare plan, you might also need to arrange for someone to care for you while your vision recovers. This is especially true for people who have poor vision in the other (non-operated) eye or elderly people who might find it difficult to get about the house without assistance.

How long does it take to recover from cataract surgery?

The initial signs and symptoms of cataract surgery improve within the first few days as your eye starts healing. During this time, you will be able to gradually return to normal activities like reading, watching TV and using a computer, depending on how your eye is healing. 

After six weeks, your eye should have healed completely, although it’s important to wait for your surgeon or eye doctor (ophthalmologist) to give you the all-clear for activities such as driving or returning to work.

Recovery and aftercare recommendations

To ensure you have the best results from your cataract surgery, it’s important to follow your doctor’s recommendations. 

Here are some guidelines for cataract surgery aftercare:

  • Don’t overdo it for the first two to three days after your surgery. Avoid lifting heavy objects or doing household chores or strenuous exercise
  • Use your eye drops as directed and take pain medicine if needed
  • Avoid touching or rubbing your eye
  • Use the eye shield at night for at least the first week
  • Bathe and shower as usual but avoid soap or shampoo getting into your eye (use the eye shield provided to you)
  • Use sunglasses when outdoors to keep your sensitive eyes protected
  • Avoid swimming until your eye heals completely (four to six weeks)
  • Avoid eye make-up for four to six weeks
  • Read, watch TV, or use a computer as much as your vision allows, but do not drive until your doctor says you can
  • Don’t undertake air travel without the go-ahead from your doctor

What contact lenses should I wear after
cataract surgery?

Once your eyes have healed, your optometrist will evaluate whether you still need to wear contact lenses to correct your vision. If you do, soft contact lenses are a good option as they tend to be more comfortable to wear. Newer materials called silicone hydrogels allow considerably more oxygen to pass through to the cornea, making them breathable and less drying on recovering eyes. 

You may also need a new contact lens prescription after undergoing cataract surgery as your vision is likely to have changed. However, it’s best to wait 6-8 weeks before scheduling an eye exam with your optometrist as your vision needs to stabilise after surgery.

All contact lens wearers should follow a meticulous cleaning routine, but this is even more important after cataract surgery. If you’re worried about keeping your contact lenses clean, choosing daily disposable contact lenses over monthly lenses is a great way to minimise the risk of developing an eye infection. To learn more about contact lens care, simply visit our contact lens resource.

How can a visiting optician support me through the recovery process?

If you are at all worried about your cataract surgery aftercare and are unable to attend an appointment in-store due to a physical or mental disability, a visiting optician can help.

Once your eyes are fully healed, an optician can visit you at home to perform a full eye test, checking your vision and the overall health of your eyes. 

During the visit, you’ll be able to discuss your concerns with your optician and report any side effects you’re experiencing.

For more information, read about our full home eye test procedure here.

Book an appointment

If you ever have any concerns about your eye health, book an appointment as soon as you can. Adults should get their eyes examined every two years, or more frequently if recommended by your optometrist, to identify any eye problems before they begin to affect vision.

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 2. National Eye Institute. (no date). Facts About Cataract. [Online]. Available at: [Accessed 31 August 2019].

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13. American Optometric Association. (no date). Cataract Surgery. [Online]. Available at: [Accessed 2 September 2019].

14. Wong, TY. Cataract surgery in patients with cataract and age related macular degeneration: do the benefits outweigh the risks? British Journal of Ophthalmology 2000;84:1337–1341 [Online]. Available at: [Accessed 2 September 2019].

15. Armbrecht AM, Findlay C, Kaushal S, Aspinall P, Hill AR, Dhillon B. Is cataract surgery justified in patients with age related macular degeneration? A visual function and quality of life assessment. British Journal of Ophthalmology Volume 84, Issue 12. [Online]. Available at: [Accessed 2 September 2019].

16. Starr MR, Mahr MA, Barkmeier AJ, Iezzi R, Smith WM, Bakri SJ. Outcomes of cataract surgery in patients with exudative age-related macular degeneration and macular fluid. American Journal of Ophthalmology 2018 Aug;192:91-97. [Online]. Available at: [Accessed 2 September 2019].

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18. STEVEN S. SARAF, CHRISTINA L. RYU, AND MICHAEL D. OBER. (2015) The Effects of Cataract Surgery on Patients With Wet Macular Degeneration. Available at: [Accessed 10 February 2022].19. Harvard Health Publishing. (published July 2010). By the way, doctor: What can I do to prevent cataracts. [Online]. Available at: [Accessed 31 August 2019].