Today, patients with cataracts can choose from several types of artificial lenses, which are surgically implanted in the eye to replace cloudy lenses that obstruct vision. A new vision simulator could help these patients see how the world would look with each type of implanted artificial lens, before they have surgery.
Click ro read more:
Cataract surgery and the replacement of the eye's natural lens with an unclouded synthetic substitute already makes use of sophisticated photonics technology, in the form of femtosecond laser sources for the crucial incisions, along with research into new optical diagnosis and treatment methods.
A team at the Spanish National Research Council (CSIC) has now developed a portable device able to simulate the multi-focal visual corrections that a synthetic intraocular lens (IOL) can provide to a patient, helping them to appreciate what the surgery might offer. The work was published inOptica.
An increasingly attractive solution for presbyopia - the loss of focusing power in the eye which comes to most with advancing years, if not before - is multi-focal lenses using diffractive or refractive profiles, resulting in bifocal, trifocal, and extended-depth-of-focus designs. Click to read more
Multifocal lenses are increasingly used solutions for presbyopia, the age-related loss of crystalline lens focus ability. These lenses work by the principle of simultaneous vision, superimposing focused and defocused images on the retina. Providing the experience of simultaneous vision to a patient before permanent implantation of a multifocal lens is a recognized unmet need to increase the patient’s confidence and optimize the lens selection. We developed a hand-held, see-through multifocal vision simulator based on temporal multiplexing of a tunable lens. The device was calibrated and validated using focimetry and Hartmann–Shack aberrometry revealing high reproducibility of the through-focus multifocal energy distribution and high optical quality. We measured visual acuity and perceptual quality on nine cyclopeged patients with three monofocal, two bifocal, and two trifocal corrections with different far/intermediate/near energy distributions simulated using the device. Visual performance and perceptual quality with multifocal corrections varied across patients, although they were more uniform across distances than monofocal corrections. Among the bifocal and trifocal designs, a trifocal with more energy at far was the most frequently identified as providing better quality. The simultaneous vision simulator proved a promising compact tool to study visual performance with multifocal corrections and to select the lens design best suited for each patient, alternative to costly and bulky adaptive optics based devices.
Click to read more
© 2016 Optical Society of America
Click here to edit.
Traditionally when patients need cataract surgery, an intraocular lens is surgically implanted into the eye to replace the patient’s natural lens inside the eye that has become cloudy and obstructs vision. When it comes to selecting the appropriate lens for implantation, the decision is typically made by the surgeon based on the condition of the patient’s lens. This often leaves patients in the dark when it comes to making a decision on surgery, and what lens is appropriate for their condition.
Spanish researchers, however, have now created a hand-held device called a simultaneous vision simulator, or SimVis, that enables patients to actually experience how different lenses would affect their vision simply by looking through the device.
Created at the Institute of Optics in Madrid, the SimVis uses an optoelectronic tunable lens that changes shape in response to an applied electric current, according to The Optical Society, which published the Spanish researchers' work in its journal Optica. Click to read more
Scientists at the Laboratory of Visual Optics and Biophotonics, Instituto de Optica, Spanish National Research Council (CSIC) are reporting on the development of a device that simulates the results of a cataract surgery for people who are considering undergoing treatment. Specifically, the system offers the option of trying out multifocal lens implants that project both focused and unfocused images on the retina.
Click to read more
By Ryan Bushey
Cataracts, a common condition related to aging where the lens of a person’s eye clouds up, affecting vision, can occur due to a variety of reasons like long periods of sunlight exposure or diseases, such as diabetes.
Tools like new eyeglasses or brighter lighting could help with the early symptoms of cataracts, according to the National Eye Institute, but surgery to remove the lens and replace it with an artificial one becomes necessary if the aforementioned solutions don’t work.
Researchers in Spain have created a hand-held device called SimVis to assist those individuals who need to undergo surgery in selecting the best artificial lens.
"Currently, the decision on which intraocular lens is implanted during cataract surgery is typically based on the explanations and experience of the surgeon," said Carlos Dorronsoro, Ph.D., first author of the paper and a research scientist at Spain’s Institute of Optics, CSIC, in a statement. "But it is difficult for patients to imagine the new visual experience provided by some of these lenses, therefore, it is very difficult to make the decision." Click to read more
Researchers in Spain have developed a hand-held device to help patients with cataracts visualize how the world would look depending on the type of artificial lens they get implanted.
The device, dubbed the simultaneous vision simulator or simply SimVis, allows patients to experience an implanted lens’ effect on their vision before surgery, according to a statement. There has been a proliferation of intraocular lenses in the past decade to replace lenses clouded by cataracts. Some correct only far vision, requiring patients to wear glasses to correct their near vision, while multifocal lenses correct both near and far vision, but with some image quality and contrast tradeoffs, according to the statement.
"Currently, the decision on which intraocular lens is implanted during cataract surgery is typically based on the explanations and experience of the surgeon," said Carlos Dorronsoro, first author of the paper, in the statement. But because it’s difficult to translate a surgeon’s descriptions into an imagined visual experience, it is difficult for patients to make the decision, he said. Click to read more
Researchers at the Instituto de Optica in Spain have developed a hand-held device that allows patients to test intraocular lens (IOLs) designs prior to implantation.
Called the simultaneous vision simulator, or SimVis, the device reportedly allows patients to experience how a certain implanted lens would affect their vision by just looking through it. The SimVis reportedly uses an optoelectronic tunable lens that changes shape in response to an applied electric current.
The researchers are reportedly now working on a binocular version of the SimVis that could simulate different lenses in each eye. Click to read more
Investigadores del CSIC crean un simulador para mostrar a los pacientes con cataratas las diferentes lentes artificiales
Investigadores del Consejo Superior de Investigaciones Científicas (CSIC) han creado un simulador, denominado 'SimVis', para mostrar a los pacientes con cataratas las diferentes lentes artificiales implantadas antes de que se sometan a una cirugía."Existen muchos tipos de lentes intraoculares en el mercado que proporcionan diferentes balances de la visión de cerca y de lejos. Hemos descubierto una forma de simular estas lentes intraoculares y demostrar un prototipo de dispositivo que permite a los pacientes probar diferentes soluciones antes de la cirugía y elegir la que mejor se adapte a sus necesidades", han aseverado los expertos, cuyo trabajo ha sido publicado en 'The Optical Society's Journal'.En la última década, las empresas de lentes han diseñado lentes intraoculares que no sólo sustituyen el cristalino opaco del ojo, sino que también corrigen la visión del paciente para reducir la necesidad de gafas, si bien esta corrección no es perfecta. Click to read more
A new handheld device can help patients visualise how their world will look through a variety of intraocular lenses (IOLs) prior to cataract surgery.
The system, nicknamed the SimVis, replicates monofocal, bifocal and trifocal IOLs – as well as their limits, from blurry distances with monofocal lenses to the loss of image quality and contrast with multifocal lenses.
Click to read more