Eccentric Viewing Techniques
In a large number of vision reducing conditions there
is often some amount of residual vision available in the peripheral
region of the eye or in patches within the overall visual field.
Eccentric viewing is a technique that can be developed to encourage
the use of these regions of vision and hopefully achieve a noticeable
improvement in visual acuity.
Imagine the eye to have a reference line passing through
the centre of its axis of rotation, by projecting this line back
the point of intersection with the retina will be the macula. This
can be considered to be the eye's principal visual axis. The brain
will always strive to ensure that the principal visual axis is directed
at any target for which clear, sharp and detailed image information
is required. Any target off the principal visual axis will, by definition,
fall onto the non-macula region of the retina where there is a lower
concentration of the cells required for detail vision but a greater
concentration of general awareness cells. This region of the retina
is used for positional awareness and general mobility vision.
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