Optometric apparatus, including and addition power mode, for sub

Details Optometric apparatus, including and addition power mode, for sub Optometric apparatus, including and addition power mode, for sub

1997-07-02

1999-07-27

Dang, Hung Xuan

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351239, A61B 302

Patent

active

059299711

ABSTRACT:
The invention relates to an optometric apparatus which is capable of easily confirming the appearance of a target for near use in a state of correction for far use. An optometric apparatus for subjectively examining a visual function of an eye to be examined includes: a pair of left and right optical units having test windows in which corrective optical systems having various optical characteristics are selectively disposed; a flapping mechanism for flapping the optical units; a target presenting mechanism for presenting a target for near use for measuring an addition power of the eye to be examined; a mode changeover mechanism for changing over a mode to an addition power mode; a input mechanism for inputting elimination and imparting of a refractive power of an addition power portion during the addition power mode; and a control mechanism for providing control such that the refractive power of the addition power portion is eliminated and imparted while a flapped state is being maintained, on the basis of an input by the input mechanism.

REFERENCES:
patent: 5444504 (1995-08-01), Kobayashi et al.
patent: 5610671 (1997-03-01), Hosoi et al.
patent: 5627612 (1997-05-01), Hayashi

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