Inside your eye is a clear lens. It is there to focus rays of light on the back of the eye. As you get older the lens can become less clear: this is known as cataract. It causes problems because the clouding of the lens cuts the amount of light that passes through and scatters the light that does get through, thus dimming and blurring the vision.
If you have been told that you have cataract the good news is that this is a treatable cause of sight loss, often as day surgery.
The vast majority of people with cataract will find that their vision is much improved after surgery. The overall success rate of cataract surgery in the UK is over 95 per cent and the chances of a serious or sight-threatening complication are less than 1 in 500. After getting your glasses updated you will be able to carry on with daily life as normal.
As yet there is no way to prevent cataract. Although there are supplements on the market which claim to help slow the progression of eye problems including cataract, medical opinion is divided on whether these help and there is no robust evidence for their benefits. Professionals suggest eating a balanced diet with plenty of fruit and vegetables, particularly green leafy vegetables. Some research papers show that smoking, poor diet and exposure to sunlight may accelerate cataract development.
The majority of cataracts are due to old age. However, they can occur due to other reasons including:
You might start noticing that your vision is less clear than before. A cataract can make things seem blurry, a bit like looking through slightly frosted glass. Some people notice a colour change, particularly if a cataract is present in one eye only, when things develop a yellowish tint. You might find the vision in one eye is more blurred than in the other. People with cataracts can have problems with night vision and find that lights, such as oncoming headlights, cause glare. Equally, bright sunny days can cause problems for the same reason.
When you find that your vision is causing problems with your life, ask your optometrist to write to your GP explaining that you have cataract. (Some optometrists can refer you directly to an eye specialist.) Your GP will arrange for you to be seen at the hospital eye clinic to discuss if an operation to remove the cataract is appropriate. At this appointment the eye specialist will look at your eyes and ask you in detail about any visual problems that you are having. They will also ask about your general health to ensure that the operation is suitable for you. Before agreeing to surgery they will outline the risks and benefits of the operation and make sure that you understand what will happen. Your eyes will be measured to work out the correct strength of replacement lens that would suit you best.
Surgeons will generally operate on one eye at a time in case there are any problems. However, both eyes can be operated on one after the other at the same sitting should you prefer.
Currently the majority of cataract operations are performed as day surgery under a local anaesthetic. You will be asked to come to the hospital at the appropriate time, then you will have your operation and then go home the same day. Make sure you arrange for someone else to take you home.
When you have cataract surgery you will be given an anaesthetic so that you don’t feel what is happening. For most people this is a local anaesthetic consisting of an injection or sometimes just eye drops alone. You will be awake, but the anaesthetist will make sure you do not feel the area around your eye. You will hear the eye specialist explaining what they are doing, but you will not see anything that is going on. At most, you will be aware of some vague movements around the eye. The specialist makes a tiny incision in the eye to remove the cataract, and will, in most cases, insert a plastic replacement lens to carry on the job of focusing light on the back of your eye. This will usually take around 30 minutes. Your eye may then be covered to help protect it for the next 24 hours, as it starts to recover.
You will be told how to look after your eye before you leave the hospital. You will be given eye drops to use for the next month to prevent infection and inflammation. Your eye will look a little red and feel somewhat gritty in the days after the operation but this should improve day by day. If you have any concerns, give the eye clinic a call for advice.
After the operation you can carry on with activities round the home as normal. Avoid eye makeup and try not to get soapy water in your eyes when you wash your hair. If you go out on a windy day you may feel safer with sunglasses to prevent grit getting in your eye. Ask your specialist about when you can return to work. If you have any concerns, give the eye clinic a call for advice.
Your eye sight will settle down usually in a few days although sometimes it can take a week or two. Your vision is often blurred for the first twenty-four hours so you should not feel disappointed if your eyesight is not clear on day one. You will soon find fewer problems with glare and an improvement in your colour vision. If you have any concerns, give the eye clinic a call for advice.
Your current specs won’t have the right prescription once your operation has been done. You will need to have your eye sight tested and may need new glasses. Make an appointment for this a few weeks after the operation: your eye specialist can advise when your eye will have settled. You may need to wait until your spectacles have been updated to start driving again.
There are now lens implants available that are “multifocal” and these enable you to see for distance and for reading without the need for glasses. They are not suitable for everybody but studies have shown that 80-90 per cent of people who have these implants become spectacle independent. Although these lenses are not perfect they produce a very high level of satisfaction in those who are suited to them. There are also available lens implants that neutralise any naturally occurring astigmatism or irregular curvature of the front of the eye. Unfortunately, these are not yet routinely available on the NHS as they are relatively expensive.
For most people, a cataract operation is entirely successful and will give them clear vision. After some months or years, a minority of people notice that their vision becomes cloudy again in the eye where the cataract has been removed. This is due to clouding of the sac which contains the replacement lens. This cloudiness can be removed with a painless and effective laser treatment in a matter of minutes. Contact your eye specialist if you are concerned that this is happening to you.
Cataract is something that many of us will experience as we get older. If you are caring for someone with cataract you can help by arranging lighting in the home to avoid glare problems. You may need to accompany the person to eye appointments and bringing them home after surgery. They may need eye drops after the surgery for a short while.
If you suspect that you have cataract make an appointment for an eye test. It is important to get a professional to check your eye health as blurred vision can have a number of causes.
If you know that you have cataract and it is causing problems with your daily life then simply ask your GP for a referral to the hospital eye clinic.