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Visual acuity is dependent on central vision only. The assessment of visual fields may yield vital information; unfortunately, visual field defects are often missed.
To examine the visual field in the left eye:
The method outlined above is suitable for the detection of gross visual field defects. An alternative method involves testing of the field of red colour vision using a red hat pin.
To detect subtle defects, and to monitor the progression of defects, perimetry is performed in a specialist centre.