QS Study

Field of vision is the area that you can see without turning your head. The visual field of each eye is the portion of the external world visible out of that eye at a given instant. The visual field refers to the whole area in which objects can be seen in the side (peripheral) vision as you focus your eyes on a middle point. It is the area of space in which objects are noticeable at the similar time when the eye is fixed and the face is turned so as to keep out the limiting effects of the orbital margins and nose.

Types: Two types –

  • Nasal field of vision.
  • Temporal field of vision.

Fig: A study of human perception – Field of Vision

Nasal field of vision: The visual area seen to the nasal side at a given instant is called the nasal field of vision. Regardless of the size of the target stimulus or position of the face, the nasal 180° meridian could not be expanded beyond 64°.

Temporal field of vision: The visual area seen to the lateral side at a given instant is called a temporal field of vision. The normal extent of the field of vision is 50° superiorly, 60° nasally, 70° inferiorly and 90° temporally.

Extension of the field of vision

Laterally up to 104° and on the nasal side 65°. In front, there is a cone-shaped area in which the two fields overlap and enjoy binocular vision.