Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

What type of lens is best after cataract surgery – multifocal or monofocal? It depends, study says

25.08.2003


Multifocal intraocular lenses improve near vision without compromising distance vision. However, patients with these intraocular lenses may experience reduced contrast sensitivity and they may see haloes around lights. These are the conclusions of a study appearing in the September issue of Ophthalmology, the clinical journal of the American Academy of Ophthalmology, the Eye M.D. Association.



Monofocal lenses are the current standard of treatment, but usually require spectacles for near vision. The choice between the two types of lenses depends on patients’ motivation to be free of glasses and contact lenses and on their having realistic expectations about the outcomes and compromises involved.

In this systematic literature review and meta-analysis of eight randomized controlled trials, the researchers examined a number of different outcomes: distance and near visual acuity, both unaided and corrected; spectacle independence; depth of field; contrast sensitivity; glare; subjective assessment of quality of life or visual function; and surgical complications.


Though there was significant variability in outcomes among the trials, in general it was found that distance acuity was similar in multifocal and monofocal intraocular lenses, and that unaided near vision tended to improve with the multifocal lens. Independence from spectacles was found in 26 percent to 47 percent of patients with multifocal lenses, but only in 1 percent to 11 percent of those with monofocal lenses. In addition, multifocal lenses increased depth of field. However, the multifocal lens also reduced contrast sensitivity and resulted in the subjective experience of seeing haloes around lights.

"This study is a very realistic interpretation of the multifocal versus monofocal tradeoff," said Academy spokesperson Samuel Masket, MD, clinical professor of ophthalmology at the Jules Stein Eye Institute, UCLA School of Medicine. "The key to choosing multifocal lenses is strong motivation on the part of the patient to be free of glasses and contact lenses. The patient must consciously accept a reduction in the quality of vision in order to have just under a 50-50 chance of being spectacle free."

Dr. Masket said because of the information and advertising about refractive surgery outcomes, many patients have high expectations. "They often anticipate that lens replacement surgery is equivalent to refractive surgery. In fact, as the study indicates, current multifocal lenses may or may not match those expectations. He added that truly accommodating intraocular lenses, which move back and forth inside the lens capsule so the eye can focus both near and far, are currently under development and will probably replace the existing types of lenses in four to six years.


The American Academy of Ophthalmology is the world’s largest association of eye physicians and surgeons – Eye M.D.s – with more than 27,000 members worldwide. For more information about eye health care, visit the Academy’s partner Web site, the Medem Network at www.medem.com/eyemd. To find an Eye M.D. in your area, visit the Academy’s Web site at www.aao.org.


| EurekAlert!
Further information:
http://www.aao.org/

More articles from Health and Medicine:

nachricht Once invincible superbug squashed by 'superteam' of antibiotics
22.08.2017 | University at Buffalo

nachricht Chronic stress induces fatal organ dysfunctions via a new neural circuit
21.08.2017 | Hokkaido University

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

Molecular volume control

22.08.2017 | Life Sciences

When fish swim in the holodeck

22.08.2017 | Life Sciences

Biochemical 'fingerprints' reveal diabetes progression

22.08.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>