Phoropter and optometry device for testing an individual's eyes
A phoropter for testing an individual's eyes when observing a target, the phoropter including two optical units for the two eyes of the individual, each having an entry on the target side, an exit aperture on the individual's side, and an optical system for providing different vision correction powers to the corresponding eye of the individual, moving means adapted to adjust the relative position of the two optical units, a partially reflecting mirror situated between the optical units and the target, an image acquiring device directed toward the partially reflecting mirror so as to acquire images of the eyes of the individual looking at the target through the two optical units, and an image displaying device suitable to display the acquired images.
1 . An optometry device for testing an individual's eyes, comprising:
a main casing;
a phoropter configured to test the individual's eyes when observing a target along an optical path, the phoropter comprising:
two optical units for the eyes of the individual that are mounted on the main casing, each having a housing that includes an entry on the target side and an exit aperture on the individual's side, and that houses an optical system to provide different vision correction powers to the corresponding eye of the individual,
a moving mechanism comprising a slider upon which the two optical units are slidably mounted to allow for adjustment of a relative position between the two optical units,
a partially reflecting mirror situated along the optical path, wherein the partially reflecting mirror is located upstream of the two optical units in the optical path along which light travels from the target to the individual's eyes, and
an image acquiring device directed toward the partially reflecting mirror so as to acquire images of the eyes of the individual looking at the target through the two optical units; and
a display device enclosed in the main casing and configured to produce the target, said target being visible through the exit apertures of the two optical units of said phoropter, the display device comprising:
a first screen configured to display a test picture used in producing said target,
a second screen configured to display a second picture, an image of the second picture being superimposed with said target at the exit apertures by way of a main partially reflecting mirror, and
at least one optical element having an optical power, said optical element being movable between an active position in which the optical element is placed on an optical path of light emitted by said first screen and exiting the device through said exit apertures, and a retracted position in which the optical element remains out of said optical path, in order for the target to be produced at a variable distance from said exit apertures, wherein
a single mirror support holds said main partially reflecting mirror and the partially reflecting mirror of said phoropter.
2 . The optometry device according to claim 1 , wherein said main partially reflecting mirror leans on a rim of a frame of a mirror support.
3 . The optometry device according to claim 2 , wherein said main partially reflecting mirror leans on said rim along its entire edge, a compressible material being layered between said main partially reflecting mirror and said rim.
4 . The optometry device according to claim 2 , wherein said main partially reflecting mirror directly leans on three or four areas projecting from said rim.
5 . The optometry device according to claim 2 , wherein an edge of said main partially reflecting mirror is blocked and layered by three or four pins.
6 . A mirror support of the optometry device according to claim 1 , comprising a casing supporting the main partially reflecting mirror and the partially reflecting mirror.
7 . The optometry device according to claim 1 , wherein said image acquiring device comprises two cameras, each camera being directed toward the partially reflecting mirror so as to acquire images of one of the eyes of the individual looking at the target through one of the optical units.
8 . The optometry device according to claim 1 , wherein said moving mechanism comprises a lever to manually adjust the relative position of the two optical units.
9 . The optometry device according to claim 8 , wherein the phoropter comprises a support element designed to receive a head of the individual and to hold the head in position and wherein said moving mechanism comprises two levers to manually adjust the positions of the two optical units relative to said support element.
10 . The optometry device according to claim 1 , wherein said moving mechanism comprises at least one motor to adjust the relative position of the two optical units, and a controller configured to process the image acquired by the image acquiring device in order to detect the positions of the individual's pupils on the image, and to control the motor as a function of the detected positions of the individual's pupils.
11 . The optometry device according to claim 10 , wherein the phoropter comprises a support element configured to receive a head of the individual and to hold the head in position, wherein said moving mechanism comprises two motors, and wherein the controller is configured to automatically control the motors so as to adjust the positions of the two optical units relative to said support element in axes of the individual's pupils.
12 . The optometry device according to claim 1 , wherein said partially reflecting mirror leans along its entire edge on a rim of a frame of a mirror support, said frame comprising three or four tongues that hold the partially reflecting mirror against said rim.
13 . The optometry device according to claim 1 , wherein the slider comprises a rod extending in an axis parallel to a plane of the partially reflecting mirror, and two sleeves that are freely slidable along the rod along the axis and are respectively connected to the two optical units.
14 . The optometry device according to claim 1 , wherein the main partially reflecting mirror and the partially reflecting mirror are located outside the respective housings of the two optical units.
15 . The optometry device according to claim 1 , wherein the partially reflecting mirror, the entry of the housing, and the exit aperture of the housing are arranged in the recited order from the target side to the individual's side along an optical axis of each optical unit.