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
Biofilm discovery suggests new way to prevent dangerous infections
23.05.2017 | University of Texas at Austin
Another reason to exercise: Burning bone fat -- a key to better bone health
19.05.2017 | University of North Carolina Health Care
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy