Vision of field are in eight meridianes.

As a research for periphery vision doing with a defining his fields are spaces, as visible with one eye in non moving, fixing , position, as a most often finding a perimeter for vision field with a which defines his borders and defects in his.
As changes for vision fields are happening as in a narrowing of his borders, or in falling out in his individual sides, and narrowing a borders for vision field is concentric and lead such levels, that from a whole field leaving just a central part, is tunnel vision field.
As narrowing for vision field is happening in vision nerve diseases, retina pathologies, quinines  poisons, neurasthenia, traumatic neurosis.
And changes for vision field is having as scotoma, as limiting defect of small part, where vision is low, but keeping, and more detailed research is computer perimeter, as with special devices, as they are finding a small defects in vision of fields and to find a first signs of eyes diseases are glaucoma, macul-dystrophy , and in a normal vision of field is having an always physiologic scotoma, or blind spot, which having from a temple side on horizontal meridian as between on 10 degrees and 20 degrees from a fixation point. This is a projection of vision nerve disk, and scotoma here defining as an absence for a light absorbing retina layer. As rising for zones are blind spot happening in vision nerve damage, retina, and vessel membrane, glaucoma, myopia, and having on they are differencing are scotoma for central and perypheric.