Abstract
An improved apparatus for measuring vernier acuity performance with elimination of proprioceptive and kinaesthetic feedback is described. This includes automatic data recording techniques. Results obtained indicate an inter-subject variation of threshold of vernier acuity between 4 sec. arc and 10 sec. arc and a correlation has been shown to exist between vernier acuity performance and length of time taken in making vernier alignments. An individual zero error in making vernier alignments has been confirmed, and the effect of coloured illumination and flickered white illumination on vernier acuity performance has been investigated.
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