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Conducted by UH College of Optometry assistant professor DavidBerntsen and his colleagues from The Ohio State University, thestudy compared the effects of wearing and then not wearingprogressive addition lenses, better known as no-line bifocals, inchildren who are nearsighted. With funding by a National Institutesof Health National Eye Institute training grant and support fromEssilor of America Inc. and the American Optometric FoundationEzell Fellowship program, the study examined 85 children from 6-11years old over the course of two years. The results were published in Investigative Ophthalmology and Visual Science. Selected according to their eye alignment and accuracy of focusingon near objects, the myopic children were fitted with either normalsingle-vision lenses or no-line bifocals to correct theirnearsightedness. In addition to observing and testing the children,the doctors obtained feedback from parents and guardians of boththe children's outdoor activities and near-work tasks, such asreading and computer use. Previous research suggested that nearsighted children who do notfocus accurately when reading books or doing other near work maybenefit more from wearing no-line bifocal glasses than nearsightedchildren who focus more accurately. Berntsen's study found a small,yet statistically significant, slowing of myopia progression inchildren wearing the bifocals compared to those who simply woresingle-vision lenses. Berntsen asserts, however, that the resultsdo not suggest that children be fitted with no-line bifocal lensessolely for the purpose of slowing the progression of myopia. "While the small effect found in the group of children wearingbifocal spectacles does not warrant a change in clinical practice,we found the beneficial effect was still present for at least oneyear after children stopped wearing no-line bifocal lenses,"Berntsen said. "This is promising if other optical lensdesigns can be developed that do an even better job of slowing howfast myopia increases in children." By understanding why different types of lenses result in theslowing of myopia progression, Berntsen says researchers will bebetter able to design lenses that may be more effective in slowingthe increase of nearsightedness in children. "Single-vision lenses are normally prescribed when a childgets a pair of glasses, but glasses with progressive additionlenses were shown to slightly reduce myopic progression in ourstudy," Berntsen said. "For any treatment that reducesmyopia progression in children to be useful, the effect of thespectacles or contact lenses must persist after children stopwearing them. The fact that the small treatment effect from ourstudy was still present one year after discontinuing the treatmentis promising. The results suggest that if newer optical designscurrently being investigated do a better job of slowing myopiaprogression, the effects may be expected to persist and decreasehow nearsighted the child ultimately becomes." An important goal of this study, in particular, was to help themimprove their understanding of the mechanism behind myopiaprogression in children and why no-line bifocals cause this smallreduction in its progression. Berntsen says the study results andevidence from other studies suggest that lenses specificallydesigned to change blur in the eye's peripheral vision may be ableto slow the increase of nearsightedness. "There is support for continuing to investigate new lensesspecially designed to change the blur profile on the back of theeye in order to reduce the increase of myopia in children,"Berntsen said. "There is still further research to be done,but our work is an important step in discovering the methods neededto slow the progression of nearsightedness.". I am an expert from jsczhy.com, while we provides the quality product, such as Manual Recliner , Car Seat Rotating, Seat Slide,and more.
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