Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

People with large pupils can now get lasik and avoid night vision disturbances

24.07.2003


People who previously were not considered good candidates for LASIK because of large pupils can now get the procedure, according to a study appearing in the July issue of Ophthalmology, the clinical journal of the American Academy of Ophthalmology, the Eye M.D. Association. By using a larger laser treatment zone on the underlying layers of the cornea, surgeons can avoid inducing night vision disturbances such as haloes and glare that patients with large pupils often experience.



In this study, the first to evaluate laser treatment zones larger than 6.5 millimeters, 352 eyes of 186 patients underwent LASIK for correction of nearsightedness and nearsightedness with astigmatism. The treatment zones varied from six to eight millimeters, depending on the size of the patient’s pupil, degree of astigmatism and amount of needed correction.

Among patients with nearsightedness, nearly 56 percent achieved uncorrected visual acuity of 20/20 or better; among those with nearsightedness with astigmatism, nearly 62 percent achieved 20/20 or better. In addition, preoperative best-corrected visual acuity and best spectacle-corrected contrast sensitivity were maintained.


Brian S. Boxer Wachler, MD, co-author of the study and a faculty member at the UCLA Medical Center, Jules Stein Eye Institute, said, "We know that corneal aberrations and night vision disturbances after LASIK are directly proportional to the degree of nearsightedness corrected and the size of the clearance zone – that is, the difference between pupil size and the optical zone treated by the laser. With this study, we now know use of large optical zones is safe and effective in preventing nighttime glare and haloes in patients with large pupils."

"This study shows using ablation zones from six to eight millimeters did not pose a problem in terms of safety. If anything, the larger optical zones had a higher percentage of eyes achieving 20/20 and 20/40 uncorrected visual acuity than the smaller zones," said Academy spokesperson James J. Salz, MD, clinical professor of ophthalmology at the University of Southern California and attending ophthalmic surgeon at Cedars-Sinai Medical Center in Los Angeles. "A subjective report on the patients’ satisfaction with their night vision outcomes and measuring these treated eyes with wavefront studies to determine the level of postoperative higher order aberrations would be a good follow-up to this study."

Dr. Boxer Wachler estimates that 50 percent of patients who have the LASIK procedure done have large pupils and would benefit from large laser treatment zones because they would be less likely to have night vision disturbances.

Media Relations | EurekAlert!
Further information:
http://www.aao.org
http://www.medem.com/eyemd

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

Thanks for the memory: NIST takes a deep look at memristors

22.01.2018 | Materials Sciences

Radioactivity from oil and gas wastewater persists in Pennsylvania stream sediments

22.01.2018 | Earth Sciences

Saarland University bioinformaticians compute gene sequences inherited from each parent

22.01.2018 | Life Sciences

VideoLinks Wissenschaft & Forschung
Overview of more VideoLinks >>>