发明名称 |
Compact subjective refractive instrument |
摘要 |
A compact ophthalmic instrument for refraction of patient's eyes is obtained by substantial folding of the optical system. The optical system is folded in one location using a reflection means that moves to vary the location of a target image being viewed by a patient for identifying the spherical power of a corrective lens, if any, required by the patient. A second folded portion of the optical system contains a cylinder means for cylindrically varying the target image.
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申请公布号 |
US4179196(A) |
申请公布日期 |
1979.12.18 |
申请号 |
US19770838178 |
申请日期 |
1977.09.30 |
申请人 |
AMERICAN OPTICAL CORP |
发明人 |
PERSSON, STAFFAN B;TACKABERRY, ROBERT B |
分类号 |
A61B3/02;A61B3/13;(IPC1-7):A61B3/02 |
主分类号 |
A61B3/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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