THE MFV LENS

Fundamentals of Multi-Filters Vision^TM

A MFV^TM lens is made of a mosaic of filters and it exploits properties of the human vision system to achieve vision improvement in selected areas of the “Visual Field”, which is that part of the outside world captured by the eyes.

MFV is the sum of two effects, one natural (MFV-1), and one designed in the lens filters (MFV-2).

MFV- 1

Eye Sensitivity Increase

as a result of reduction of light	forced by the light filters together

MFV- 2

Brightness Control

of different parts of the visual field	forced by each filter different opacity

The increase in sensitivity (MFV-1) is not noticed when wearing sunglasses, (have you ever noticed it?), because the increase in light recording power by the retina sensors (result of the higher sensitivity) is inferior to the reduction caused by the dark sunglasses.

Example: if the sunglasses reduce light by 70% even a 100% increase in eye sensitivity will not compensate because:
100% x (1-70%) = 30%, and 30% x (1 + 100%) = 60%, for a total light reduction of 40%.

But if, instead of a single solid filter, the lens has two or more filters . . . things change as described in this page.

The Eye-Brain Vision Control Loop Brightness Control of the Scene Making Areas of Interest “Briter”MFV^TM and Glare

The Eye-Brain Vision Control Loop

The eyes and the brain create the images we call “vision”. The photo-sensors in the retinas collect light information and send it to the brain, that converts this information into two images, that combined create a 3-dimensional picture. Like a video camera, the brain performs a critical auto-exposure function.
If the information produces images that are too bright, the brain adjusts some parameters of the eye to darken the future images. In reverse, if ambient light is reduced, and the images get dark, it takes opposite actions to increase the sensitivity of the eye.

The eye-brain vision feedback loop:
light reduction => eye-sensitivity increase
and
light increase => eye-sensitivity reduction

This negative feedback mechanism, called “eye-adaptation”, is one of the two effects (MFV-1) exploited by the Multi-Filters Vision^TMtechnology.

Brightness Control of the Scene

Envision yourself wearing a pair of glasses with lenses made with a mosaic of filters of different strength and looking at a wall of uniform luminosity and brightness. As each filter has different light transmission, the eyes will receive different levels of light intensity from the various sections of the wall. A part of the wall covered by a strong or dense filter will appear darker than another part covered by a weak or light filter.

In the resulting image in the brain, the uniform wall will not appear as uniform, but it will yield an image with the same brightness profile as the mosaic of filters in the lens.

the light transmission percentages of each filter
act as a brightness-control for each part of the wall.

Making Areas of Interest “Briter^TM”

Common sunglasses give comfort, but, in most cases, they do not improve vision, because they cut light uniformly and the contrast between an object and its background remains basically the same. Test your vision acuity using your sunglasses: stand in a sunny location and look for things at some distance, especially in the shade, or for signs somewhat difficult to read. Then wear sunglasses and you’ll verify that you actually don’t see better.

It is different with Multi-Filters Vision^TM lenses.

Consider this ‘virtual” experiment: you are wearing standard sunglasses that cut (i.e.) 70% of light and let 30% through. Then imagine making a circular cut in the center of each lens and replace it with a lighter filter that lets through more light, i.e. 40%. With this change, the eye will receive from the center of the vision field about …..% more light and, assuming a scene of about the same luminosity . . .

THE CENTER APPEARS NOW “BRITER“ THAN THE REST OF THE SCENE.

Furthermore . . .

If you leave the cut in the lens “open”, the center of the scene will now appear brighter than it was when looking with naked eyes. This case is defined as “MFV-100-X”, where part of the lens is clear and the rest has the light transmission of X%.

MFV^TM and Glare

Glare and even a large area of medium brightness (like the sky) can have a negative effect on vision acuity. The presence of very strong light or too much medium-high light causes a reduction of the eye sensitivity and of the brightness of the entire scene, with a noticeable vision acuity loss. Everyone has experienced, while driving, how a strong reflection or the sun itself, can suddenly darken the vision of the street. As said before, common sunglasses give people the impression of better vision, because they make an uncomfortable situation comfortable. But, again, if one tests the vision acuity will verify that there is no real improvement.

A multi-filters lens, with a light filter in its center and dense filters elsewhere will exploit the two effects of a) cutting the disturbing sources and b) exploiting the eye-sensitivity gain on the “target of interest”.

But, is the “target of interest” always in the center of our vision field?

Mostly yes, because if something appears in the corner of the eyes, one reacts by turning the head or the eyes in that direction,

which moves the object of interest to the center of the vision field, where MFV makes it brighter. This eye movement is a semi-automatic reflex because the center of the retina has the highest density of photosensors.

It is important to state that the advantages of the MFV sunglasses over common sunglasses increase when the light conditions worsen and just when vision help is mostly needed.