Bright Sight

Oliver Backhouse, Consultant Eye Surgeon

How to choose your lens

If you are over 40 and wishing to be free of glasses then you should consider the revolutionary high definition Comfort lens which has many advantages over laser vision correction. The success of this lens allows both cataract and non-cataract patients almost complete freedom from glasses for far, intermediate and near vision. Even if you are short sighted, long sighted or have astigmatism, the Comfort lens can give you permanent vision correction.

  1. Monofocal The standard lens used in cataract surgery. Glasses will be needed after.
  2. Comfort A multifocal lens for patients who wish to be free of glasses.
  3. Lentis Toric Custom made lenses to correct astigmatism.
  4. Comfort Toric For patients who wish to be free of glasses and who have astigmatism.

Why choose a Monofocal Lens?

Traditionally this has been the only lens available in Cataract surgery. A monofocal lens has a fixed distance of focus. If your point of focus following cataract surgery is for the distance then you will still need glasses for intermediate and near vision. Sometimes unaided vision for distance and near can be obtained by using the concept of Monovision. With this the dominant eye is focused for distance leaving the other eye focused for near vision. Patients can often enjoy excellent distance and near vision without glasses but some patients are not happy with Monovision as it can reduce the quality of both distance and near vision to a degree by not having the eyes focused together.

Monofocal Lens


Why choose the Comfort Lens?

The Comfort lens can be used in any Lens Refractive Surgery for people with shortsight, longsight, astigmatism, Prelex (Presbyopia Lens Exchange) and for Cataract Surgery. The ultimate aim is to give you clear vision for far, mid and near-range objects without the need for glasses. This type of surgery has significant advantages over other types of refractive surgery including Laser and Monovision.

  • Removal of your natural lens means you will not develop cataracts as you get older with other types of refractive surgery such as laser you can still develop cataracts and/or have a continuing change in your prescription
  • Magnification is at a natural level.
  • Full peripheral (side to side) vision.
  • Permanent solution to a focusing problem.
  • No upper age limit.
  • Use in short-sighted and long-sighted eyes.

With a traditional 'fixed focus' artificial lens you will still need glasses to change your distance of object viewing. The Comfort lens used in both eyes can produce good distance, intermediate and near vision. Unlike the Accommodating lenses available the Comfort lens has near and far focus built into the lens design rather than relying on the slightly unpredictable movement of an Accommodating lens to produce near vision. You are likely to enjoy useful near and far vision again without glasses or contact lenses. The Comfort lens has advantages over other Multifocal lenses currently available as it gives good near and far vision in differing lighting conditions independent of the pupil size as well as reduced glare / halos / contrast disturbance and no waxy vision as can be seen with some other types of lens.

What Results to Expect
Once the decision that lens surgery will be beneficial to you, your eyes will be measured to calculate the power of the artificial lens that will give you improved vision. The Yorkshire Eye Hospital has some of the most advanced technology to allow the highest degree of accuracy when it comes to measuring your eyes. The microsurgery is performed under eye drop anaesthesia as a day case procedure through a 2.75mm wound that usually requires no stitches. This allows a rapid ability to return to work after a few days. The operation risks are the same as for cataract surgery. The second eye can be done a week after the first eye. You are likely to have the best results if both eyes have this special type of lens. The improvement in vision occurs over the first few days and continues to improve over the weeks and months ahead. Your vision should be clearer and colours brighter. Click here for the detailed for the detailed Comfort lens consent form.

Comfort lens


Not everyone will gain the same result with this lens and unfortunately it is not possible to predict how much effect you will get before the operation. The benefit of the lens comes from the strength of the muscles inside your eye. Just as people have differing strengths of handshakes so the muscles inside the eye have differing strengths. There is therefore no guarantee that you will be completely glasses free. In fact it is likely that you will need reading glasses for sustained near vision such as reading. While an accommodating lens has been designed to provide accommodation for all eyes not everyone will see 6/6 (20/20 USA) vision at all distances. Remember, most people do not have 6/6 vision at all distances yet function quite comfortably. This type of lens has a slightly increased rate of capsule clouding which may require a Laser Capsulotomy.