Comparison of the Quality of Vision Provided by AMO Tecnis Z9000 and Alcon Laboratories MA60 Acrysof Posterior Chamber Intraocular Lenses

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00348270
Recruitment Status : Completed
First Posted : July 4, 2006
Last Update Posted : May 12, 2010
Information provided by:
Singapore National Eye Centre

Brief Summary:
This study is a comparison of the quality of vision provided by AMO Tecnis Z9000 three-piece silicone posterior chamber intraocular lens and Alcon Laboratories MA60 three-piece acrylic posterior chamber intraocular lens.

Condition or disease Intervention/treatment Phase
Cataract Device: Tecnis Z9000 intraocular lens Device: MA60 intraocular lens Phase 4

Detailed Description:

Today, intraocular lenses (IOLs) are routinely implanted after cataract extraction. Cataract surgical techniques are constantly developing due to innovations in surgical implantation and IOL manufacturing processes. Although material development and surgical implantation have advanced extensively during the past several years, there has been little attention paid to the improvement of the optical quality of IOLs.

It has been documented that the vision of an IOL patient is no better than that of a person with healthy eyes of a similar age, i.e., when a 65-year-old patient with cataracts has them removed and implanted with an IOL, the resulting visual outcome is no better than the visual quality of a 65-year-old without cataracts. The fact that the visual quality of the IOL patients is no better than that of their same-age counterparts is surprising because an IOL is optically superior to the natural crystalline lens. This fact may be explained by aberrations.

Aberrations cause incoming light that would otherwise be focused to a point to be blurred, which in turn causes a reduction in visual quality. This reduction in quality is more severe under low luminance conditions because ocular aberrations increase when the pupil size gets larger. The Z9000 is an IOL that is designed to counteract the spherical aberration of the cornea and thus improve the resulting visual quality of IOL patients.

Different materials and lens designs result in different visual quality. The handling of the lens, proper centration in the eye, the postoperative course, and the optical image may vary depending on the design of the lens. Two lenses will be compared: AMO Tecnis Z9000 three-piece silicone lens and Alcon Laboratories MA60 three-piece acrylic lens.

This will be a randomized, evaluator-masked study in bilateral cataract surgery patients. Each patient will be assigned to a AMO Tecnis Z9000 lens in one eye and an Alcon Laboratories MA60 lens in the other eye. All first surgeries will be on the right eye. A randomization list will be used to decide lens allocation.

A total of 80 patients (men and women) from the Singapore National Eye Centre will be enrolled in the study. All patients will undergo wavefront analysis 90-120 days postoperatively.

The two lens models look different, even in the eye, after implantation. It is not possible to mask the individual investigator at the time of surgery or personnel responsible for conducting the clinical ocular examinations (e.g., evaluation of complications, posterior capsule, IOP, pupil size) and optic evaluations (e.g., evaluation of the IOL).

Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 80 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single
Primary Purpose: Treatment
Official Title: Comparison of the Quality of Vision Provided by AMO Tecnis Z9000 Three-piece Silicone Posterior Chamber Intraocular Lens and Alcon Laboratories MA60 Acrysof Three-piece Acrylic Posterior Chamber Intraocular Lens
Study Start Date : July 2005
Actual Primary Completion Date : October 2008
Actual Study Completion Date : October 2008

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Cataract Eye Care
U.S. FDA Resources

Primary Outcome Measures :
  1. The primary outcome of this comparative study is the best corrected mesopic log contrast sensitivity function of eyes implanted with Z9000 and MA60 lenses at 6 cycles/degree, 90-120 days postoperatively.

Secondary Outcome Measures :
  1. The best corrected mesopic log contrast sensitivity function of eyes implanted with Z9000 and MA60 lenses at 1.5, 3, 12, and 18 cycles/degree, 90-120 days postoperatively
  2. The change in best corrected mesopic log contrast sensitivity function after cataract surgery (postoperatively minus preoperatively) at 1.5, 3, 6, 12, and 18 cycles/degree
  3. The residual spherical aberrations of the postoperative eye using wavefront analysis
  4. Logarithm of the minimum angle of resolution (LogMAR) visual acuity
  5. Postoperative ocular complications/adverse events

Information from the National Library of Medicine

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Ages Eligible for Study:   50 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Bilateral cataracts, eligible for phacoemulsification with primary implantation of a posterior chamber IOL
  2. Males and females 50 to 80 years of age
  3. Expected maximum of 6-weeks and minimum of 3 weeks interval between a single patient's surgeries
  4. Best corrected visual acuity (BCVA) should be no better than 20/40 in the presence of a glare source. (In the early treatment diabetic retinopathy study [ETDRS] visual acuity chart, better than 20/40 will be at least 3 letters read correctly in the 20/30 line).
  5. Best corrected visual acuity projected by Potential Acuity Meter (PAM) or other reliable potential acuity test procedure to be 20/30 or better in each eye after cataract removal and IOL implantation.
  6. Naturally dilated pupil size (in dim light) ≥ 4.0 mm (with no dilation medications) - both eyes
  7. Anticipated correction with an IOL of +6 to +30 diopters (both eyes)
  8. Evidence of a personally signed and dated informed consent document indicating the patient (or a legally acceptable representative) has been informed of all pertinent aspects of the trial
  9. Willing and able to comply with scheduled visits and other study procedures

Exclusion Criteria:

  1. Preoperative pathology: amblyopia, rubella cataract, proliferative diabetic retinopathy, shallow anterior chamber, macular edema, retinal detachment, aniridia or iris atrophy, uveitis, history of iritis, iris neovascularization, medically uncontrolled glaucoma, microphthalmus or macrophthalmus, optic nerve atrophy
  2. Previous intraocular or corneal surgery, including refractive surgery, corneal transplant
  3. Other pathologies potentially affecting visual acuity, e.g., macular degeneration, glaucoma with the presence of visual field defects
  4. An increased risk for complications which could require vitreoretinal surgery
  5. Corneal irregularities potentially affecting visual acuity, e.g., keratoconus, corneal dystrophy
  6. Corneal opacities
  7. Keratometric astigmatism exceeding 1.5 diopters
  8. Patient in whom postoperative refractive error is planned to be different between fellow eyes (anisometropia) such as in cases where postoperative refraction is planned for mono-vision
  9. Current contact lens usage (within 6 months prior to first surgery and/or during the study)
  10. Other ocular surgery at time of cataract extraction
  11. Uncontrolled diabetes
  12. Any neurological condition that might interfere with performance of required tests
  13. Immune deficiency disease
  14. Other severe acute or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with study participation or study device implantation or may interfere with the interpretation of study results and, in the judgment of the investigator, would make the patient inappropriate for entry into this study
  15. Use of any systemic or topical drug known to interfere with visual performance

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00348270

Singapore National Eye Centre
Singapore, Singapore, 168751
Sponsors and Collaborators
Singapore National Eye Centre
Principal Investigator: Wei-Han Chua Singapore National Eye Center Identifier: NCT00348270     History of Changes
Other Study ID Numbers: R367/25/2004
First Posted: July 4, 2006    Key Record Dates
Last Update Posted: May 12, 2010
Last Verified: May 2010

Keywords provided by Singapore National Eye Centre:
Intraocular lens

Additional relevant MeSH terms:
Lens Diseases
Eye Diseases