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Modern Cataract Microsurgery

What is a cataract?

A cataract is a clouding of the natural focusing lens in your eye. It is usually a part of the normal aging process and most people over the age of 70 have some signs of cataract. Light cannot pass through a cataract easily, so the retina only receives blurred and distorted images. The retina is then unable to send clear signals to the brain, and vision is gradually impaired. Other symptoms include excessive dazzle from car headlights or bright sunshine and the need to change glasses frequently. If cataracts are not removed all vision may be lost, but usually only in very advanced cases and the decision whether or not to have cataract surgery depends on how much your daily life is affected.

Fortunately, almost all cataracts can be successfully removed and vision restored through modern microsurgery.

Cataract Microsurgery

Modern cataract surgery begins with a very small incision, approximately 3mm wide in the eye. These small incisions seal themselves immediately after surgery and heal over the following few weeks. No stitches are used, and normal daily activities can be resumed soon after surgery. Another advantage of no-stitch incisions is that they are less likely than other incisions to cause a focusing problem known as astigmatism. In fact, depending upon where the incision is made, no-stitch incisions can actually reduce astigmatism which exists naturally in some patients before surgery.

After the incision has been made, a small instrument is used to create a round opening in the lens capsule. Another instrument, called a phacoemulsification tip, is then inserted through this opening. Phacoemulsification uses high-speed ultrasound waves, vibrating 40,000 times per second, to break the cataract into tiny pieces which are then sucked out of the eye. Ultrasound is currently the most effective method for removing cataracts.

Once the cataract has been removed, a lens implant is placed in the lens capsule to replace the focusing power of the natural lens.

Lens implants are very small ( 6-12mm) and are designed to fit permanently within the lens capsule, where they replace the focussing function provided by the natural lens. They are made of stable polymer plastics which will not be rejected by the eye. Lens implants come in different powers, as do glasses or contact lenses and are selected to improve the eye's focusing ability. Many people discover that lens implants improve their vision and give them greater freedom from their glasses than they enjoyed before they developed cataracts.

Painless Cataract Surgery

Thanks to recent developments in anaesthesia, cataract surgery is a painless experience and the vast majority of operations are now done as a day case procedure. I commonly use two kinds of anaesthesia - topical anaesthesia and regional anaesthesia.

Topical anaesthesia is very popular with many people because no needles are required. Instead, topical anaesthesia simply uses drops which numb the eye. No eye patches are needed and people usually notice improved vision immediately after surgery.

Regional anaesthesia involves gently injecting a local anaesthetic into the tissues around the eye. The eye is patched overnight and people begin to notice their improved vision by the next day.

Topical anaesthesia is now my preferred technique as it offers a quicker recovery with fewer side effects and is completely pain free. The eye is fully anaesthetised but otherwise you are awake during the procedure, which takes about 15 minutes. This means the operation can usually be done as a 'day case', which has many advantages such as shortening the time in hospital and reducing expense for the patient. Local anaesthesia also avoids the post-operative 'hangover' from a general anaesthetic, as well as avoiding the risks of an anaesthetic in patients with, for example, chest problems. The majority of my patients now have their operation done using only anaesthetic drops on the eye (topical anaesthesia), although of course, general anaesthesia is still available for patients who prefer to be completely asleep.

Many patients worry that they will see what is happening during the operation. Most patient notice a bright light and vague shapes but you cannot see the actual instruments.

Furthermore, although you have to lie fairly still, there is no need to be rigidly immobile; you can adjust your position or even cough or sneeze, provided some warning is given. These days, age or infirmity is no longer a bar to successful cataract surgery.


Risks and Benefits

In recent years there have been enormous advances in cataract surgery that make the operation safer and improve the visual outcome. However, you should be aware that there is a small risk of complications, either during or after the operation. Complications are usually treatable, possibly requiring further surgery. In a few cases serious problems such as infection or retinal detachement occur which may result in visual loss.

Overall the benefits of cataract surgery include:

• Improved Colour Vision: Colours are brighter and more vivid.


• Greater Clarity of Vision: Vision is crisper and sharper.
  
  
• Improved Quality of Life: Studies have shown that people enjoy improved quality of life after successful cataract surgery. Many people can resume driving and activities such as reading, sewing, golf and using a computer are generally easier after cataract surgery.
  
  
• Greater Freedom From Corrective Lenses: Because lens implants are selected to compensate for pre-existing focusing problems, most people find that their vision improves considerably after surgery. Ideally, people are able to see clearly without glasses after surgery, although glasses may be necessary for some activities such as reading or driving. Even people who still need to use glasses can usually use thinner lenses than they relied upon in the past. In patients with high levels of astigmatism I now routinely carry out additional incisions (LRI's) to help change the shape of the eye, reducing astigmatism and decreasing reliance on spectacles.
  
  
• Multifocal lenses - no reading glasses: The restor lens now offers the possibility of clear focus for near and distance without the use of glasses following cataract surgery in selected cases. Many people are delighted with this option but it does have some drawbacks which Mr Tanner will be happy to discuss with you in more detail.

If you would like to make an appointment to discuss cataract surgery please contact my secretary:

Jackie McLaren
Telephone : 01189 553457
E-mail: secretary@tanner-eyes.co.uk