MFV^TMTEST MODELS FOR LOW VISION

Goal of this page is to show what MFV^TM technology can do for Low Vision.
The devices described are protected by patents and are for experimental purpose only.

How to identify vision zones on the lens areas

A MFV-LV lens has two areas: ZOI and ZLI. Area ZMI (*medium interest is not used in Low Vision):

Select eyewear
Select target. i.e. a plate to make seeing food easier, or a work-space
Use stickers to create a screen that hides the target from view
- Shape and place stickers on lenses. If properly done the target is hidden from view
- Make sticker somewhat larger that the target
- Make ZOI shape easy to obtain by cutting a semi-hard material,
ZOI is the lens area covered by the sticker. ZLI is the rest of the lens.

Acronyms for LTC values

LTC: Light Transmission Go efficient: 0% (black) to X% (light to dark) to 100% (clear) .
100: 100% LTC. A clear lens, or a hole. All light goes through.
VH: Very high LTC. Close to a clear lens.
MH: Medium-high LTC.
ML: Medium -Low LTC.
VL: Very Low LTC, dark, close to black. (No light goes through. Black. Taped area of lens.)
ZOI: part of the lens covering the Zone Of Interest of the scene in front of the eyes
ZLI: part of the lens covering the Zone of Low Interest of the scene.,

MFV ^TM Applied to Low Vision

The fundamentals of MFV^TM vision improvement are:

MFV-1: increase eye sensitivity by reducing light reaching the eyes,
MFV-2: use filters densities to control the brightness of different zones of the visual field.

Additional MFV^TM fundamentals for the low vision case are:

MFV-LV-1: reduce the number of lens areas (and filters) to two; ZOI and ZLI.
MFV-LV-2: select size of ZOI not larger than the necessary.
MFV-LV-3: use a large difference in density between the ZOI and ZLI filters.

Example for MFV-LV-2: if the goal is to help an person to see better what’s in his plate, the light/clear filter zone (ZOI) should cover the plate and a small surrounding area.

Warning

To increase vision acuity in one part of the FOV, dark filters are used to reduce light coming from the other parts of the FOV. And, if a black filter (0% light transmission) is used to maximize contrast enhancement, a part of the FOV is now completely blocked from view.

These cases, while providing the highest improvements, demand extreme cautiousness: these devices (labeled MFV-X-0) should be used only for stationary or not-mobile activities.

Read table of risk below.

Activities and risks

Activity types	Examples	Risk of accidents
STATIONARY, NOT_MOBILE: person doesn’t move AND FOV doesn’t change	Eating, reading, working at a desk	Small to none
MOBILE: person moves OR FOV changes.	Walking. Driving	High
SEMI-MOBILE: Person’s movements are limited in space and are not the primary purpose of the activity.	Weeding in a garden.	Medium

Examples of MFV TM Test-models for Low Vision

Publishing of MFV TM Test-models Eyewear is held until some liability isses have been resolved.

Contact Briter Vision for information or for getting held material under special permission.

MFV TMTEST MODELS FOR LOW VISION

How to identify vision zones on the lens areas

Acronyms for LTC values

MFV TM Applied to Low Vision

Activities and risks

MFV^TMTEST MODELS FOR LOW VISION

MFV ^TM Applied to Low Vision