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fan ban shi dian kong dan shi biao shi li biao ji qi lin chuang ying yong
Author(s): 
Pages: 197-198+257-259
Year: Issue:  3
Journal: Acta Academiae Medicinae Suzhou

Keyword:  electric visual acuity chartsingle optotype;
Abstract: In this instrument the"E"type is adopted,which is arranged in harmonic progression or ingeometric progression.When operated by electricity a single optotype is rapidly and randomlyshowed in the window of this instrument at a time.It is clinically verified that this instrument canexamine the visual acuity in place of the current visal chart,preventing effectively the false of vi-sual acuity.This instrument also has the advantage of being small,easy operated,safe and accu-rate.It is a new instrument for examination of visual acuity.
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