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 How cancer metastasis happens: Researchers reveal a key mechanism
19.01.2018 | Weill Cornell Medicine

nachricht Researchers identify new way to unmask melanoma cells to the immune system
17.01.2018 | Duke University Medical Center

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: Artificial agent designs quantum experiments

On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.

We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Let the good tubes roll

19.01.2018 | Materials Sciences

How cancer metastasis happens: Researchers reveal a key mechanism

19.01.2018 | Health and Medicine

Meteoritic stardust unlocks timing of supernova dust formation

19.01.2018 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>