The TecnisTM ZM900 Multifocal IOL  TECNIS MULTIFOCAL
Posterior Chamber Intraocular Lens (IOL) Tecnis ZM 900
The TecnisTM ZM900 Multifocal IOL is developed by Advanced Medical Optics, Inc.
The TECNIS® IOL was designed using wavefront analysis of human corneas. As a result, the TECNIS® IOLs aspheric surface significantly reduces spherical aberrations and improves patient outcomes providing safer, sharper vision.
While traditional lens implants may improve your vision, only the TECNIS™ lens improves functional vision as was shown clinically in night driving simulator testing. Based on these test results, the TECNIS™ IOL is likely to provide a meaningful safety benefit for older drivers and the drivers and pedestrians with whom they share the road.
 
These are simulated images to represent the difference
between the TECNIS™ IOL and a traditional IOL.
Specifications
Model Number ZM 900
Optic Diameter 6.0 mm
Optic Type Modified prolate anterior surface, Diffractive posterior surface, square optic edge
Diffractive Power +4.0 diopters of add , 50/50 light distribution
Haptic Angulation 6 degrees (anterior angulation)
Haptic Configuration CapC Haptic Design
A-Constant 119.0
Refractive Index 1.46
Diopter Range +5.0 trough +34.0 diopter
Material UV-absorbing Polysiloxane
What is it?
The TECNIS MULTIFOCAL IOL is foldable, ultraviolet light-absorbing posterior chamber artificial lens for implantation in the eye to restore vision after a clouded natural lens (cataract) is removed.
The lens of the IOL is convex on both sides (biconvex) and made of a silicone (polysiloxane) that can be folded prior to insertion, allowing placement through an incision smaller than the optic diameter of the lens.
After insertion into the eye, the lens gently unfolds to restore vision. The supporting arms (haptics) provide for proper positioning of the IOL within the eye.
How does it work?
The TECNIS MULTIFOCAL IOL is intended to be positioned for replacing the natural lens in the posterior chamber of the eye to correct the visual impairment of aphakia (absence of the natural lens).
The TECNIS MULTIFOCAL IOL is shaped using a special process that distribute the light between the distance and near focus approximately 50/50 to provide increased depth of focus.
When is it used?
The TECNIS MULTIFOCAL IOL is used in adult patients with and without presbyopia, who desire multi-distance vision with reduce spectacle dependency following cataract surgery.
What will it accomplish?
The TECNIS MULTIFOCAL IOL has been shown in a clinical study to provide good near, intermediate and distance vision and thereby reduce spectacle dependency in patients who have undergone cataract surgery. The Tecnis Multifocal lens has enhanced ophthalmologists IOL options. Not only does this lens perform as a foldable, diffractive, multifocal IOL with an improved near addition, its optic also incorporates intelligent asphericity to counteract most corneal spherical aberrations. I now have more than 1 years clinical experience with this lens.
DESIGN
An overview of an option for presbyopic correction that is designed to reduce spherical aberration.
The Tecnis Multifocal IOL is based on the aspheric optic design of the Tecnis IOL (Advanced Medical Optics, Inc.), which was engineered to reduce the spherical aberration of an average cornea. Based on a principle of diffractionas is the Acrysof Restor IOL (Alcon Laboratories, Inc., Fort Worth, TX)the Tecnis Multifocal IOL features diffractive rings on its posterior surface. The lens provides patients with a near and a distant focus, each of which is distinct.
The rings start very close to the optics center and then continue out toward the periphery, usually with an increasing distance between the rings. As a result, the multifocal effects dependence on the pupil is limited. Even in the presence of relatively small pupils, this IOL provides excellent near vision.
CLINICAL RESULTS
A series of clinical studies has demonstrated the excellent performance of the Tecnis monofocal IOL under mesopic and scotopic lighting conditions. My results with the Tecnis Multifocal IOL during the past year have shown the lens to be especially effective in emmetropic and hyperopic presbyopes, because their corneas seem to be closer to the average corneal asphericity incorporated into the design of the lens. These patients reading capabilities are excellent. As for optical aberrations, every lens with more than one focus will be associated with some degree of glare or halos, because one image is laid over another. It may be that patients who receive the Tecnis Multifocal and whose corneas fit the parameters considered typical by the designers of the aspheric Tecnis platform will be less affected by halos. Regardless, this multifocal lens should be an excellent option for patients with hyperopic or emmetropic presbyopia who are undergoing cataract surgery or refractive lens exchange.
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