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The measurement of visual acuity regards the central vision, i.e. the ability to distinguish objects which we are looking at. However, the peripheral vision is equally important in our lives. It is the perception of objects that we do not look directly at but understand with "the corner of our eye."
The measurement of visual acuity regards the central vision, i.e. the
ability to distinguish objects which we are looking at. However, the
peripheral vision is equally important in our lives. It is the
perception of objects that we do not look directly at but understand
with "the corner of our eye."
In older children or adults with a high level of cooperation, the
appraisal of their visual fields is done using special machines
called "perimeter" or simply "optical fields".
In this test, small bright stimuli light (one each) at specific
locations and the examinee is asked to press a button each time, to
confirm that he saw the stimulus light that just went on. To be
credible, such a control method requires full cooperation from the
examinee, and is often problematic even with adults.
In younger children it can only be a rough estimate of their visual
field. Here again, each eye is examined separately and the test is to
move a small toy or lens, from the side of within the field of child,
observing the angle where the child can perceive.