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Glasses with automatic adjustable focus

IP.com Disclosure Number: IPCOM000246581D
Publication Date: 2016-Jun-20
Document File: 3 page(s) / 57K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a modified pair of glasses with automatic adjustable focus, thus able to set the correct focus where the user is looking, without user's direct action. In this article is introduced how the state of art can be improved by using lateral cameras on this device.

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Glasses with automatic adjustable focus

Disclosed is a modified pair of eyeglasses with an adjustable focal length. They compensate for refractive errors (such as presbyopia) by providing variable focusing, allowing users to adjust them for desired distance or prescription, or both. Current bifocals and progressive lenses are static (the user has to look through the top of the lens for distant objects and down through the bottom of the lens for near objects)

while adjustable focus eyeglasses have one variable focal length, without having to change where one is looking.

There are currently two basic methods to achieve variable focal length in the state of art: electro-optical and opto-mechanical . Electro-optical often uses liquid crystals as the active medium. Applying an electric current to the liquid changes the refraction index of the liquid. Opto-mechanical spectacles allow focus control by the

wearer via movement of a small slider located on top of the bridge
[1][2][3][4][5][6][7][8]. The user manually adjusts the lens for optical clarity at the desired distance. They are a combination of rigid and flexible lenses that can change prescription to enable sharp focus at different distances.

Another type of opto-mechanical lens [9] uses liquid pressure against a diaphragm to control focus of a lens. These lenses were meant to provide improved vision

without prescription by an optometrist, since these professionals are in short supply in many countries. Each eyepiece encloses a reservoir of fluid silicone and the user adjusts the level of fluid with a dial until they are satisfied with the result. The solutions listed above require user's manual control of the focus. The focal distance is changed by a mechanism located on the glasses, requiring periodic adjustment as the user switches his gaze to nearer or further objects, so this approach comes to be not so user-friendly.

The main advantage of our approach, in comparison with the state of art, is represented by the automatic accommodation of the focus achieved using various type of sensors that make the invention aware of the position of the eye and so to measure the distance of the targeted object and adjust automatically the lenses' focus.

The idea consists in a pair of glasses modified to meet the required conditions in order to adjust the lenses focus automatically. These main steps are:
- recognize the gaze direction of the glasses user;
- measure the distance between lenses and object that the user is looking at.

The disclosed system achieves the first step by adding on both...