March 6, 2021

Developed zoom lenses that are activated when blinking | Technology

Can you imagine being able to zoom with your own view just like a camera on a mobile? Having a superhuman vision will be possible in two years, according to researchers from the University of San Diego (California). This team has created robotic lenses that are controlled by small muscle movements to zoom in and out (with zoom effect) and in the blink of an eye, that is, with a single blink.

Contact lenses Smart are made of polymers (chemicals) that expand when an electric current is applied, and is controlled by five electrodes surrounding the eyes. When the polymer becomes more convex, the lens focuses effectively. "The human-machine interface has developed between the human eye and a biometric lens that is made of electroactive polymer films," says the report.

Do not press any button like on cameras. In this case, the lens detects electrooculographic signals (the intensity of the movement of the eyes and eyelids that allow to measure the state of the muscles). There is an electric field in the tissues surrounding the human eye, and a measurable potential difference between the front and back of the eye, so when electrodes are placed on the skin around the eye, that difference can be measured when the eye moves. “The world of contactology is changing a lot. For example, we have contact lenses with sensors that can measure both intraocular pressure and sugar levels, ”says Dr. Jesús Merayo, Director of the University Institute of the Fernández-Vega Ophthalmological Foundation.

But, this system, which is still in preliminary phase, is controlled by manual or pre-designed programs. Normally, the eye receives the light stimuli from the environment. The light passes through the transparent media and the lens of the eye forms an inverted image in the retina. That is where specialized cells transform the image into nerve impulses. With this invention electrooculography signals generated by ocular movements (up, down or right to left, and vice versa) are used, which help control movement and focal length. "Smart lenses can be the future for visual prostheses, adjustable glasses and remote robotics," says the report.

Samsung has applied for a patent to produce smart contact lenses that, although it sounds like science fiction, will also have a built-in camera, a display unit and print sensors

There are no risks or side effects. “The problem would be to stop working. Or stop zooming at a certain distance because of the electronic properties of the lens, ” says Dr. Merayo. “In Spain, 13 million contact lenses are used and the same precautions should be taken as with conventional ones: follow the recommendations of the contactologist, which are mainly the time to be taken and hygiene. In summer it is important that have no contact with the pool water. In September, cases of parasite infections arrive and are easy to avoid by taking these precautions for use ”, warns.

The big brands want to be the first in the technological background race. Samsung has applied for a patent to produce smart contact lenses that, although it sounds like science fiction, will also have a built-in camera, a display unit and print sensors.

Although, at the moment, it is necessary to refine this invention a lot before the users of conventional glasses or contact lenses consider changing to a lens of this style. Not many are willing to live with electrodes stuck in the face, therefore, it is essential to integrate all electronic components in the lens before marketing them on a large scale.

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