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EFFECTIVE ACUITY AND REFRACTION TARGETS
专利权人:
发明人:
申请号:
EP11842072.8
公开号:
EP2640257A1
申请日:
2011.11.16
申请国别(地区):
EP
年份:
2013
代理人:
摘要:
A viewing target for a visual acuity and refraction measurement includes at least one line comprising a width dimension that is below a resolution limit width (hereinafter "RLW") of a test subject visual acuity, and an adjustable length dimension that is initially set at greater than the RLW of the test subject visual acuity. A base, at least approximately intersecting the line, has a thickness along the direction of the length of the line that is greater than the RLW of the test subject visual acuity. The length dimension of the line is adjustable in increments small enough to effectively approximate the visual acuity of the test subject by determining a shortest resolvable line and a next smaller line that is not resolvable by the test subject.
来源网站:
中国工程科技知识中心
来源网址:
http://www.ckcest.cn/home/

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