초록 ▼

This invention relates to a cupola-type visual stimulation ophthalmological apparatus for examining the visual field of a patient and performing electrophysiological examinations. It comprises a projection screen consisting of the inner surface of a hemispherical cupola, the patient\s eye being disp

This invention relates to a cupola-type visual stimulation ophthalmological apparatus for examining the visual field of a patient and performing electrophysiological examinations. It comprises a projection screen consisting of the inner surface of a hemispherical cupola, the patient\s eye being disposed centrally of the cupola during the examination. A device for projecting visual stimuli on the screen is provided in the upper portion of the cupola and comprises essentially a casing incorporating a light source, filter means, an object mask, a lens and a movable reflecting mirror located in the vicinity of the cupola center. This mirror is adapted to project toward any desired point of the screen a luminous stimulus perceived by the patient for measuring the extent of the patient\s visual field. Moreover, with the projection device it is possible to illuminate the complete visual field according to criteria relating specifically to electrophysiological examinations. For this purpose, the casing comprises a window adapted to be masked for examining the visual field and to be opened for making electrophysiological examinations, the light rays from the light source being deflected through the window for illuminating the complete screen surface. The various optical control members necessary for performing visual tests can also be used for electrophysiological examinations since the projection device is polyvalent and thus capable of accomplishing both types of examinations.

대표청구항 ▼

Apparatus for examining the field of vision of a patient, comprising a dome of hemispherical shape provided on its inner surface with a screen having a central fixation point, means for positioning the head of a patient with his eye just below the center of said dome and directed toward said fixatio

Apparatus for examining the field of vision of a patient, comprising a dome of hemispherical shape provided on its inner surface with a screen having a central fixation point, means for positioning the head of a patient with his eye just below the center of said dome and directed toward said fixation point, unitary means for illuminating said screen and projecting a movable stimulating image on said screen, said unitary illuminating and projecting means comprising a casing, a light source in said casing, a small mirror located below said light source and just above the center of said dome, optical means for transmitting a beam of light along an optical axis from said light source to said mirror, said optical means comprising a condensing lens, variable filter means, image producing means and a focusing lens for projecting an image on said mirror for reflection by said mirror onto said screen, means for mounting said mirror for rotation about first and second axes perpendicular to one another, first motor means for selectively rotating said mirror about said first axis and second motor means for selectively rotating said mirror about said second axis to produce movement of said image on said screen, a window aperture cut in a wall of said casing between said light source and said mirror, light-reflecting means hingedly mounted at a lower side of said window aperture for movement between a first position in which it closes said window aperture and a second position in which it intercepts the transmission of light from said light source to said mirror and directs light from said light source out through said window aperature to illuminate said screen, said entire unitary illuminating and projecting means including said casing, said light source, mirror, lens, filter means, image producing means, and mirror mounting and rotating means, being disposed within a space immediately above the patient\s head and just beyond the upper limit of the patient\s field of vision.