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Type of IOL Implant
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MONOFOCAL

Monofocal IntraOcular Lens (IOL) Implant


This is by far the most commonly used implant with the IOL power chosen for seeing distant. For near vision, the patient requires reading glasses. The advantage of this IOL is excellent clarity for distant vision.



Optical Principles of Monofocal IOL




Monofocal IOL has a fixed-range single focal point. It has a fixed focusing power which is set for distant vision. Recent refinements in the optical quality of these lenses have allowed an even higher quality of vision than previously achievable.



Monofocal IntraOcular Lens (IOL) Implant

1. Akreos IOL ( , USA)

This hydrophilic acrylic single piece square edge IOL has excellent optical clarity which minimizes problems of internal reflections associated with any IOL implanted in the eye with its anti-glare technology. As such, this IOL would be suitable for patients who suffer from glare during the day.
2. Acrysof ( , USA)

This hydrophobic acrylic single piece IOL has excellent haptic flexibility to allow easy implantation. The biconvex optic design reduces the incidence of posterior capsule opacification to around 1% compared to the average 10% in other IOLs.
3. Acrysof Natural ( , USA)

This IOL is able to filter both UV and blue light because of a patented yellow tint incorporated into the IOL. It is thought that UV and blue light can be harmful to the retina and can potentially contribute to macular degeneration. As such, this IOL would be suitable for patients who are at risk of macular degeneration.


4. TECNIS™ IOL ( , USA)

This is the 1st IOL which claims to improve functional vision in various lighting conditions due to its modified prolate lens surface which simulates the optical performance of a young person. As such, the IOL is designed to help your eye function younger than your age! This lens is suitable for those who drive as the IOL helps drivers recognize objects on the road sooner and therefore have more time to react.
 
5. XLSTABI-ZO ( , France)

As the world’s leading optics company, Carl Zeiss looks back on a long history of experience in developing aspheric lens concepts and solutions for a variety of products such as cameras, microscopes, spectacles, telescopes and binoculars. Carl Zeiss innovative Aspheric intraocular lenses offer you the best in opti­cal innovation: a high-quality image and enhanced contrast perception during all your daily activities, whatever the lighting conditions may be. Aspheric lenses allow you to achieve a visual performance that is close to that of a young person‘s eye.



MULTIFOCAL
Multifocal IntraOcular Lens (IOL) Implant


This IOL is designed to solve the problem of focusing for near after cataract extraction so that the patient does not need reading glasses. The main problem with this IOL is that there is an average reduction in contrast sensitivity between 30-50% depending on how much light is weighted for near and how much for distance. There is also the problem of glare and haloes due to the multiple concentric focusing power within the IOL. In a European study, 90% of patients are not wearing glasses for distance and 80% do not need reading glasses. However, the intermediate vision remains slightly out of focus.



Optical Principles of Multifocal IOL



Multifocal IOL has specialized optical properties that can divide light to bring it into focus at more than one point at the same time. This IOL is designed with concentric rings which can focus light rays from both distance and near simultaneously.



Multifocal IntraOcular Lens (IOL) Implant

1. TECNIS™ Multifocal ( , USA)
 

is a multifocal diffractive aspheric refractive IOL which may reduce aberrations in addition to giving reasonably good and near vision.
 
 
2. ReStor ( , USA)
 

is a combined refractive/diffractive IOL whereby incoming light is directed towards 2 focal points giving good distant and even better near vision but not intermediate vision.
 
 
3. AT LISA ( , USA)
 

AT LISA is a new generation of high performance multicocal lens from Carl Ziess, which provides high patient satisfaction to presbyopic patients with increased safety. It provides an excellent optical performance at all distances in all light conditions.


The Benefit of Carl Zeiss AT LISA multifocal IOL at a glance

L
Light distributed asymmetrically between distant (65%) and near focus (35%) for improved intermediate vision and greatly reduced halos and glare

I
Independency from pupil size due to high performance diffractive-refractive microstructure covering the complete 6.0 mm optical diameter

S
SMP technology for a lens surface without any sharp angles for ideal optical imaging quality with reduced light scattering

A
Aberration correcting optimized aspheric optic for better contrast sensitivity, depth of field and sharper vision



 
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