#field_of_view__field  the area that is visible (as through an optical instrument)
  supertype:  visual_percept__visual_image  a percept that arises from the eyes; an image in the visual system
  subtype:  microscopic_field__microscopicfield  the areas that is visible through a microscope
  subtype:  operative_field__operativefield  the area that is open during surgery

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