The presbyopia, generally known as tired eyesight, is an eye disease that normally occurs after age 45 due to the loss of flexibility of the crystalline. This loss makes it costs us more to see up close with clarity. Let's make a photographic analogy: it's as if a lens with autofocus on a camera breaks down and has a hard time focusing at close range, or even impossible.
The photographic comparison has its reason for being. Researchers from the Department of Electrical Engineering at Stanford University have just develop a prototype of smart glasses based on objectives very similar to those used in photography. The device has been precisely created to curb the effects of presbyopia.
In tests that have been conducted with several participants most of them preferred this device instead of the progressive lens glasses, which are what are normally used for presbyopia. These require making movements with the head or eyes that can cause accidents.
The system created by these researchers is quite bulky, so it would be necessary to develop a miniaturized model in the future so that it could be used outside of a laboratory. The device uses a very sophisticated hardware and objectives, because to focus incorporate a system of moving lenses. As with photographic lenses.
A objective that contains a liquid inside to allow you to focus by an electrical impulse. To detect the movement of the eyes and guess where to focus, use a Intel RealSense R200 camera that allow to analyze the depth. In addition, to analyze the movement of the eyes, a Eye movement detection system of the company Pupil Labs.
The innovator of all this is that the prototype works at a very fast speed, because the system allows to change the focus in 150 milliseconds. A speed almost imperceptible to the eye. The prototype is therefore a kind of fusion of electronic and optical systems.
The great challenge faced by a system of this type is the miniaturization of its components to achieve glasses that can be used on a day-to-day basis. Something that is not easy, mainly because of the optical components. That they are not simple to miniaturize. Especially considering that liquid lens technology is still at an early stage of development.
There would be the possibility of creating an electronic vision system, like that of the electronic viewfinders of the mirrorless cameras that have replaced the optical viewfinders of the SLRs. These viewers along with cameras of small size, like those of the telephones could produce a similar effect. The problem is that electronic screens generate an artificial image, even in the most advanced viewers, and the light they give off is not exactly highly recommended for eye health.