Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Nearsighted children may benefit from rigid contact lenses

14.12.2004


New research suggests that rigid gas permeable contact lenses may help slow the progression of nearsightedness, or myopia, in young children.



At the end of a three-year study of more than a hundred 8- to 11-year olds, researchers determined that wearing rigid gas permeable (RGP) contact lenses slowed the progression of myopia by nearly 30 percent, compared to soft contact lens wear.

Only recently did researchers find that young children could handle the responsibility of wearing contact lenses. Rigid contact lenses alter the shape of the cornea, which plays a small role in the development of myopia, said Jeffrey Walline, the study’s lead author and an adjunct assistant professor of optometry at Ohio State University.


He and his colleagues caution that the RGP lenses won’t stop myopia in its tracks, and also that the effects of these lenses probably aren’t permanent. But the researchers also say that RGP lenses could be a good option for nearsighted children who can adapt to wearing them. "Severe myopia, which is fairly rare, can lead to a detached retina and permanent vision loss or glaucoma," Walline said. "Theoretically, wearing RGP lenses could lessen the severity of myopia, and likewise the chances of developing one of these problems.

"But it’s also a matter of convenience – keeping myopia’s progression in check may mean that a child can see his bedside clock, or walk to the bathroom in the middle of the night without having to depend on glasses."

The study appears in the December 2004 issue of the journal Archives of Opthalmology.

While myopia can develop at any age, it most often begins during childhood, around ages 8 to 14. Progression typically slows by the mid-teens for females and by the mid-20s for males.

The researchers evaluated 116 children who participated in the Contact Lens and Myopia Progression (CLAMP) study at Ohio State. All children were given about two months to adapt to wearing the rigid contact lenses before the study officially began. "It takes most children about two weeks to get used to this type of contact lens," Walline said. "We wanted to make sure the children could handle the rigid lenses for the long-term."

At the end of the two-month initiation period, children were randomly assigned to wearing RGP lenses or two-week disposable soft contact lenses. Children returned to the optometry clinic each year for three years for annual vision checkups.

A normal eyeball is round, while a nearsighted eye is shaped like an egg – somewhat oval. This irregular shape is the most common cause of nearsightedness. "To have a permanent effect, contact lenses would ideally control the shape of the eyeball as it grows," Walline said. "The RGP lenses did not do that. However, they did change the shape of the cornea on a short-term basis."

While the cornea plays a small role in myopia’s development, the RGP lenses were able to change the cornea’s shape enough to lessen myopia’s progression by 28.8 percent. The rigid contact lenses kept a condition called "corneal steepening" to a minimum – because the nearsighted eye takes on a more oval shape, the cornea becomes steeper than that of a normal, round eye.

Soft contact lenses had no effect on the shape of the cornea, or on the progression of myopia.

The children in both groups wore their lenses an average of 70 hours a week. The researchers aren’t sure how many hours a day a child would have to wear RGP lenses in order to slow the progression of nearsightedness.

"Rigid contact lenses may offer visual and eye health benefits that soft contact lenses don’t," Walline said. "These harder lenses allow more oxygen to reach the cornea than do most soft contacts, and they do a better job controlling astigmatism. These factors, in addition to the modest myopia control, should be weighed against the initial discomfort that sometimes goes along with RGP lens wear when deciding what a child should use to correct his vision problems."

Previous studies suggest that about four out of five children can adapt to wearing RGP lenses, which cost about $160 a year, Walline said. For comparison, disposable contact lenses – like the kind used in this study – cost about $260 a year.

Walline conducted the CLAMP study with Ohio State optometry colleagues Lisa Jones, Donald Mutti and Karla Zadnik, the Glenn A. Fry professor of optometry.

CLAMP received funding from the National Eye Institute; Menicon Co, Ltd, CIBA Vision Corporation, and SOLA Optical – all contact lens manufacturers; and an American Optometric Foundation William C. Ezell Fellowship. The authors have no relevant financial interest in the sponsors of the study.

Jeffrey Walline | EurekAlert!
Further information:
http://www.osu.edu

More articles from Health and Medicine:

nachricht New malaria analysis method reveals disease severity in minutes
14.08.2017 | University of British Columbia

nachricht New type of blood cells work as indicators of autoimmunity
14.08.2017 | Instituto de Medicina Molecular

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

A Map of the Cell’s Power Station

18.08.2017 | Life Sciences

Engineering team images tiny quasicrystals as they form

18.08.2017 | Physics and Astronomy

Researchers printed graphene-like materials with inkjet

18.08.2017 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>