Question

Anna is experiencing a restricted field of vision. another term for this is

Answer 1

The term is tunnel vision, restricted field of vision. A restricted field of vision less than 20 degrees wide. The ratio measurement of vision describes visual acuity, or the sharpness of vision, at 20 feet from an object, it is also describe the clarity of the vision. 

Answer 2

Tunnel Vision

It is the loss of external vision with preservation of primary vision this occurring in a compressed orbicular tunnel which is like a field of vision concept. When the whole of vision is occupied by one part or a division of a complete panorama or photo. This is expected to the interest in that one appearance of the photograph.