Optometer having optotype disc which rotates about its axis and

Details Optometer having optotype disc which rotates about its axis and Optometer having optotype disc which rotates about its axis and

1994-12-29

1996-05-21

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351243, G03B 1700

Patent

active

055194613

ABSTRACT:
An optometer including a main body which has an observation window having a center axis, a rotary optotype disk having circumferentially arranged optotypes and disposed within the main body such that the optotype disk is rotatable about a rotary shaft so that one of the optotypes is brought into alignment with the center axis and viewed through the window, a driving disk rotatable about the center axis and rotatably supporting the rotary shaft such that the rotary shaft is parallel to and radially offset from the center axis, a rotary actuator for rotating the driving disk, and a stationary disk fixed within the main body coaxially with the driving disk and engaging the rotary shaft so as to cause rotation of the optotype disk about the rotary shaft when said driving disk is rotated about the center axis by the rotary actuator.

REFERENCES:
patent: 3355237 (1967-11-01), Simpson
patent: 4410243 (1983-10-01), Furste
patent: 5129720 (1992-07-01), Jovicevic

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