Intermittent exotropia, a condition in which the eyes turn outward while looking at an object, occurs in about 1% of American children and is less common than esotropia, where the eyes turn inward.
In an article published in the March 2010 issue of the American Journal of Ophthalmology, researchers from the Mayo Clinic and Mayo Foundation, Rochester, MN, followed 135 patients with intermittent exotropia over a 20-year period and found that slightly more than 90% of these children became nearsighted by the time they reached their 20s.
One of the few studies following the progression of myopia (near sightedness) in children with intermittent exotropia, researchers determined that the rate of developing myopia in this population was 7.4% by 5 years of age, 46.5% by 10 years, and 91.1% by 20 years. Neither simple observation nor surgical intervention altered the rate of myopic progression. This rate is significantly higher than any previously reported population and suggests that intermittent exotropia is significantly linked with the development of myopia. Other studies have shown incidences of 3-5%, 24% and 45% in similar age groups.
The study recommends that children with intermittent exotropia should be followed closely by their ophthalmologists for two reasons: the misalignment of their eyes and the nearly certain development of myopia by the time they leave their teenage years.
According to Brian G. Mohney, MD, Department of Ophthalmology, Mayo Clinic and Mayo Foundation, "These findings further confirm the relationship of refractive error and strabismus; that esotropia is associated with hyperopia, which is more common among Western populations, while exotropia is linked with myopia, and more prevalent among Asians. It is unknown if these associations are genetic, environmental, or both, and further investigations are warranted."
Interestingly in Asian populations exotropia is more common and occurs at twice the rate of esotropia.
The article is "The Development of Myopia Among Children With Intermittent Exotropia" by Noha S. Ekdawi, Kevin J. Nusz, Nancy N. Diehl, and Brian G. Mohney. It appears in the American Journal of Ophthalmology, Volume 149, Issue 3, (March 2010), p 503-507, and is published by Elsevier
Rachael Zaleski | EurekAlert!
Diagnoses: When Are Several Opinions Better Than One?
19.07.2016 | Max-Planck-Institut für Bildungsforschung
High in calories and low in nutrients when adolescents share pictures of food online
07.04.2016 | University of Gothenburg
Physicists from the University of Würzburg have designed a light source that emits photon pairs. Two-photon sources are particularly well suited for tap-proof data encryption. The experiment's key ingredients: a semiconductor crystal and some sticky tape.
So-called monolayers are at the heart of the research activities. These "super materials" (as the prestigious science magazine "Nature" puts it) have been...
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
28.10.2016 | Power and Electrical Engineering
28.10.2016 | Physics and Astronomy
28.10.2016 | Life Sciences