VF I(Visual Field Index ) is not an international governing body of a game /sports.
What is a regular visual field index?
The VFI can vary from 100% (normal visual field) to 0% (perimetrically blind field). The VFI is less sensitive than the MD to the effects of cataract or diffuse media opacities. VFI is intended for use in estimating rates of progression and staging glaucomatous functional injury.
What is an uncommon visual field test?
A test that delivers visual field loss means that vision in some areas is not as sharp as normal. It could be just a small vision lost in a small area, or all vision lost in large spaces. The amount of vision lost and the areas involved are measured by the visual field test.
To learn more about Visual Field Index, refer
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