Optometer having optotype disc which rotates about its axis and another axis.

摘要

An optometer including a main body (10) which has an observation window (12) having a center axis (16), a rotary optotype disk (28) having circumferentially arranged optotypes (11a-11d, 48a-48l) and disposed within the main body such that the optotype disk is rotatable about a rotary shaft (30) so that one of the optotypes is brought into alignment with the center axis and viewed through the window, a driving disk (20) rotatable about the center axis (16) and rotatably supporting the rotary shaft (30) such that the rotary shaft is parallel to and radially offset from the center axis, a rotary actuator (22) for rotating the driving disk, and a stationary disk (34) 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. <IMAGE>