Millions of people suffer from presbyopia, aging of the eye lens. When natural aging occurs, among other things, the eye lens becomes less elastic, making it difficult for the lens to accommodate to different distances. Older people tend to hold reading material at arms length, for example, due to presbyopia.
Eye with eight gliding planes cut in the lens using laser technology.
Up to present, therapy has not been able to increase the elasticity of the eye lens. Thus, the Laser Zentrum Hannover (LZH), together with the Laserforum in Cologne and the Eye Clinic in Bonn (all in Germany) have carried out first studies to find a way to increase the flexibility of the eye lens.
Investigations from the last few years at the LZH have shown a laser can be used to cut fine grooves in the eye lens. The grooves form gliding planes in the tissue of the lens and can restore elasticity. A special kind of laser is used for cutting, a femtosecond laser (fs-laser), which is not only extremely precise, but which also makes very fine cut grooves. Since the size and position of the lens differ from patient to patient, control and monitoring of the cutting is done via optical coherence tomography (OCT).
More that 200 pig eyes and over 40 human autopsy lenses were successfully treated in vitro using laser technology. Cut configuration and the laser parameters were optimized to retain the biomechanics of the lens. Furthermore, some animal lenses were also treated in vivo.
Investigations have shown that light reflexes due to the cutting pattern appear immediately after treatment, but later disappear. Other investigations on long-term complications, especially concerning cataracts and clouding of the lens, have not yet been completed, but are positive in tendency.
The fibers of human eye lenses are in principal similar in size and structure to the animal lenses which were treated. However, whether it is possible to use fs-laser technology for treating presbyopia without causing clouding of the lens is still subject to further testing. In summary, the results already achieved are so positive, that there is a very promising outlook on the future treatment of presbyopia using laser technology.
Michael Botts | idw
Why might reading make myopic?
18.07.2018 | Universitätsklinikum Tübingen
Unique brain 'fingerprint' can predict drug effectiveness
11.07.2018 | McGill University
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.
Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
18.07.2018 | Materials Sciences
18.07.2018 | Life Sciences
18.07.2018 | Health and Medicine