Abstract: A visual field test device includes: first probability density function acquisition unit performs step (1) of obtaining a probability density function f(x1) for a result value x1 obtained in a first visual field test; a stimulation threshold determination unit performs step (2) of setting a stimulation threshold t1 to a value in the range of x1 in the f(x1); a test result acquisition unit performs step (3) of obtaining test results indicating if a result greater than or equal to t1 was obtained in the first visual field test; a second probability density function acquisition unit performs step (4) of obtaining a probability density function f(x2) by removing probability density values that's greater than or equal to t1, or removing values that are less than t1 from f(x1); and a determination unit performs step (5) of determining if a standard deviation ? of the f(x2) is below a predetermined value.

Abstract: A visual field test device includes: first probability density function acquisition unit performs step (1) of obtaining a probability density function f(x1) for a result value x1 obtained in a first visual field test; a stimulation threshold determination unit performs step (2) of setting a stimulation threshold t1to a value in the range of x1 in the f(x1); a test result acquisition unit performs step (3) of obtaining test results indicating if a result greater than or equal to t1was obtained in the first visual field test; a second probability density function acquisition unit performs step (4) of obtaining a probability density function f(x2) by removing probability density values that's greater than or equal to t1, or removing values that are less than t1from f(x1); and a determination unit performs step (5) of determining if a standard deviation ? of the f(x2) is below a predetermined value.

Abstract: A vision testing device capable of reducing a psychological sense of uneasiness, stress and the like given to a testee when a vision test is performed with a main body of the vision testing device mounted on a head portion of the testee, including: a device main body mounted on a head portion of a testee who undergoes a vision test, and having display devices for displaying a test image for the testee and a camera for photographing an external image; a switch operated by the testee; and a display control unit which performs switching of display images to be displayed on display devices between a test image and the external image photographed by the camera when the switch is operated under a predetermined operation condition in a state that the test image is displayed on the display devices.

Abstract: Physical burden when a head-mounted display is mounted to the head of a user for use is reduced. A head-mounted display unit includes a head-mounted display, and a fixing stand configured so as to enable the attachment and detachment of the head-mounted display, and to enable the head-mounted display to be mounted in a fixed state. The fixing stand includes a base member, a support column projecting perpendicularly upwards from the base member, a pedestal mount attached to an upper end portion of the support column, a retaining member attached to the pedestal mount, a clamping implement, and a chin rest. The fixing stand is configured such that the head-mounted display is detachably mounted to the retaining member using the clamping implement.

Abstract: A head mount-type vision testing device, which is a head-mount type vision testing device mounted on a testee's head, including: a device main body having display devices for displaying a visual target for the testee and imaging devices for imaging eyeballs of the testee; a mounting fixture for mounting the device main body on the testee's head; and a controller that displays images of the eyeballs imaged by the imaging devices on the display devices, so that the testee can recognize a positional displacement state of the eyeballs caused by a positional displacement of the device main body mounted on the testee's head using the mounting fixture.

Abstract: A small-sized head-mount type vision testing device, which is mounted on a testee's head, including: a display device that presents a visual target to an eyeball of the testee; a display optical system that guides light of the visual target presented on the device to the retina; an imaging device that images the eyeball; and an observation optical system that guides an image of the eyeball to the imaging device, and further including a mirror that reflects light of a specific wavelength and transmits the other light at a point closer to the eyeball side than the display device, wherein an optical axis from a pupil to the mirror in the display optical system and an optical axis from the pupil to the mirror in the observation optical system, coincide with each other, and the optical axes are bent through the mirror.

Abstract: A vision testing device and a vision testing program are capable of obtaining a correct test result while reducing an accumulation of fatigue added on one of the eyes of a testee, including: image displays that present a light for suppressing a dark adaptation for both eyes of a testee; and image displays that present a target for an eye (L, R, or both) of the testee so that the target is presented for one of the eyes before the vision testing for the other eye is ended.

Abstract: When displaying visual targets on a planar display element and performing vision examinations, the size of the visual target visible to the subject changes according to the position at which the visual target is displayed. This vision examination device includes: a planar display element that displays visual targets to a subject of a vision examination; and a display optical system provided upon an optical axis between an eyeball position at which an eyeball of the subject is arranged and a display screen of the planar display element. The display optical system includes an f-? optical system having a proportional relationship between an image height on the display screen of the planar display element and the angle of incidence ? for the main light rays when the subject views the visual target through the display optical system from the eyeball position.

Abstract: A head mount-type vision testing device, which is a head-mount type vision testing device mounted on a testee's head, including: a device main body having display devices for displaying a visual target for the testee and imaging devices for imaging eyeballs of the testee; a mounting fixture for mounting the device main body on the testee's head; and a controller that displays images of the eyeballs imaged by the imaging devices on the display devices, so that the testee can recognize a positional displacement state of the eyeballs caused by a positional displacement of the device main body mounted on the testee's head using the mounting fixture.

Abstract: Physical burden when a head-mounted display is mounted to the head of a user for use is reduced. A head-mounted display unit includes a head-mounted display, and a fixing stand configured so as to enable the attachment and detachment of the head-mounted display, and to enable the head-mounted display to be mounted in a fixed state. The fixing stand includes a base member, a support column projecting perpendicularly upwards from the base member, a pedestal mount attached to an upper end portion of the support column, a retaining member attached to the pedestal mount, a clamping implement, and a chin rest. The fixing stand is configured such that the head-mounted display is detachably mounted to the retaining member using the clamping implement.

Abstract: A vision testing device capable of reducing a psychological sense of uneasiness, stress and the like given to a testee when a vision test is performed with a main body of the vision testing device mounted on a head portion of the testee, including: a device main body mounted on a head portion of a testee who undergoes a vision test, and having display devices for displaying a test image for the testee and a camera for photographing an external image; a switch operated by the testee; and a display control unit which performs switching of display images to be displayed on display devices between a test image and the external image photographed by the camera when the switch is operated under a predetermined operation condition in a state that the test image is displayed on the display devices.

Abstract: A small-sized head-mount type vision testing device, which is mounted on a testee's head, including: a display device that presents a visual target to an eyeball of the testee; a display optical system that guides light of the visual target presented on the device to the retina; an imaging device that images the eyeball; and an observation optical system that guides an image of the eyeball to the imaging device, and further including a mirror that reflects light of a specific wavelength and transmits the other light at a point closer to the eyeball side than the display device, wherein an optical axis from a pupil to the mirror in the display optical system and an optical axis from the pupil to the mirror in the observation optical system, coincide with each other, and the optical axes are bent through the mirror.

Abstract: When displaying visual targets on a planar display element and performing vision examinations, the size of the visual target visible to the subject changes according to the position at which the visual target is displayed. This vision examination device includes: a planar display element that displays visual targets to a subject of a vision examination; and a display optical system provided upon an optical axis between an eyeball position at which an eyeball of the subject is arranged and a display screen of the planar display element. The display optical system includes an f-? optical system having a proportional relationship between an image height on the display screen of the planar display element and the angle of incidence ? for the main light rays when the subject views the visual target through the display optical system from the eyeball position.

Abstract: A vision testing device and a vision testing program are capable of obtaining a correct test result while reducing an accumulation of fatigue added on one of the eyes of a testee, including: image displays that present a light for suppressing a dark adaptation for both eyes of a testee; and image displays that present a target for an eye (L, R, or both) of the testee so that the target is presented for one of the eyes before the vision testing for the other eye is ended.

Abstract: There is provided an optical system of an optical pick-up for recording/reproducing data to/from at least two types of optical discs including a first optical disc and a second optical disc whose recording density is higher than that of the first optical disc. The optical system is provided with a light source unit for the first and second optical discs, an objective lens, and a photo detector. The optical system further includes an optical surface to satisfy compatibility between the at least two types of optical discs, the optical surface being located between the light source unit and one of the at least two type of optical discs. The optical surface has an inner region having a numerical aperture for the first optical disc, an outer region located having a numerical aperture for the second optical disc, and an intermediate region that is located within the outer region at a periphery of the inner region.

Abstract: There is provided an optical system of an optical pick-up for recording/reproducing data to/from at least two types of optical discs including a first optical disc and a second optical disc whose recording density is higher than that of the first optical disc. The optical system is provided with a light source unit for the first and second optical discs, an objective lens, and a photo detector. The optical system further includes an optical surface to satisfy compatibility between the at least two types of optical discs, the optical surface being located between the light source unit and one of the at least two type of optical discs. The optical surface has an inner region having a numerical aperture for the first optical disc, an outer region located having a numerical aperture for the second optical disc, and an intermediate region that is located within the outer region at a periphery of the inner region.