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Refractive Cataract surgery

Patients diagnosed with lens opacification in cataracts require surgery to correct their eyesight. There is no medical cure for cataracts.

Cataract patients are faced with choices as to which intra ocular lens best suits their lifestyles. Some patients after cataract surgery are happy with distance glasses independence and a reading spectacle for near and intermediate tasks. This is the standard cataract operation.

However, some patients would like total independence of glasses ie no glasses for reading, computer and distance. These patients can choose various refractive cataract surgery techniques:

1. Monovision:  Dominant eye set for distance 
   Non dominant set for near (reading)

This works well for patients who have been successful contact lens monovision wearers in the past. A small disadvantage is a minor loss of binocular vision, noted in the first 3 to 6 months.

2. Multifocal implants

These lens implants are placed in both eyes which result in glasses free distance, computer and near correction.

The advantage here is that both eyes retain similar vision and binocularity.

3. Toric Implants

These lenses correct astigmatism so that distance vision can be spectacle free. They can also be multifocal giving total independence from glasses.

Please note that these choices must be thoroughly discussed with Dr Deist before any choice is made.

Examples of Intra ocular lenses are as follows:

Cataract Brochure

Multifocal Intra ocular lens implant (IOL)

Finevision IOL

FineVisionThe Finevision lens allows more than 90% of patients to function optimally without spectacles.This IOL allows patients excellent intermediate and near vision while maintaining good distance vision. The Finevision lens combines two diffractive interfaces to allow +3.50 addition for near vision and +1.75 addition for intermediate vision. The optics integrated into the design of the Finevision maintains the quality of the vision in varying light conditions. The diffractive pattern depends on pupil size and allows more energy for distance vision in dim conditions.

The advantages of a Finevision lens include the following: excellent stable centration due to a four point fixation system and the aspheric optic corrects corneal spherical aberration providing the patients with good depth of field and normal contrast sensitivity. Few patients complain about post op halos, glare and night vision disturbances compared with other bifocal lenses.

Multifocal Intra ocular lens implant (IOL)

Tecnis Symfony IOL

Tecnis Symfony ToricThe Tecnis Symfony Extended Range of Vision IOL helps correct presbyopia by providing high quality vision ranging seamlessly from near to far under all light conditions. The Tecnis Symfony Toric Extended Range of Vision IOL in addition corrects astigmatism. The aim of these premium lenses is to obtain spectacle independence. This is achieved by using two technologies in conjunction, namely:

The elongation of the focus of the eye to provide extended range of vision

To correct chromatic aberration thereby allowing sharp vision in varying lighting conditions.

Monofocal intraocular lens implant (IOL)

Tecnis Aspheric IOL

TecnisThe AMO Tecnis lens is a wavefront designed aspheric IOL which is FDA approved to improve functional vision. Patients will have good distance vision but require spectacles for near tasks such as reading.

A night driving simulator performance study shows that patients with the Tecnis IOL have a faster reaction time and good functional vision in low light conditions. The advantages of the Tecnis IOL include stability, improved vision in low light conditions and high definition vision in good light.

CT ASPHINA 509MP IOL

CT Asphina IOLThe CT ASPHINA 509MP, aspherical lens is a premium monofocal intraocular lens (IOL). It has been implanted for the past 12 years in cataract surgery worldwide and used to replace your cataractus natural crystalline lens. The CT ASPHINA can also correct your myopia or hyperopia, as well as some of the aberration produced by the cornea. By correcting these aberration’s you are assured of better contrast sensitivity and visual acuity.  The IOL is made from a hydrophilic acrylic material and due to the polishing technique has a hydrophobic surface, this together with its square edges, reduces the chances of posterior capsular opacification (PCO). The IOL comes preloaded to facilitate ease of use during implantation and reduces the risk of complications. 

Toric IOL

AT TORBI 709M

AT Torbi IOLThe Carl Zeiss, AT TORBI, Bitoric intraocular lens (IOL), is based on the same platform as the CT ASPHINA 509MP. Its shape and aspheric design has been proven to offer excellent stability and is less likely to rotate, which is extremely important when it comes to correcting for astigmatism.

It is used as an alternative to a monofocal IOL, in cataract surgery. This type of IOL has the ability to not only correct for refractive errors such as myopia or hyperopia, but also to correct astigmatism (an irregular curvature of the cornea). In order to ensure the correction, calculations are required. Your, AT TORBI IOL will be calculated and customized to correct your eyes refractive error and astigmatism. Should you however have an extremely high cylinder of astigmatism, your Bitoric IOL calculation will be sent to Germany for special and careful calculation and will require custom manufacturing. This process can take up to six weeks. Stock of the standard range is kept in South Africa and can be delivered within 24 hours. The AT TORBI is one of a few toric IOL’s which offers a precise correction of one’s astigmatism and due to the Bitoric technology, i.e. being able to use both the front and back surface of the IOL, Carl Zeiss is one of only two companies in South Africa who are able to offer up to a 12Diopter of cylinder correction. 

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