US 4,059,348 A · Objective plotting of visual fields by eye movement monitoring

Abstract

An apparatus for measuring and evaluating a subject's visual field presents a target image, consisting of a spot of light, at a series of selected locations within the subject's visual field. Means are provided to monitor his resulting eye movement and positions in response to each target presentation. A projection apparatus presents the target images at various locations and in a programmed sequence. The apparatus also includes means for making a photographic plot of those presented targets which the subject has seen or missed, as desired. Determination of whether subject has seen or missed a particular target is evaluated by logic systems which discriminate between eye movement and positions displaying characteristics indicative of whether the subject has seen or missed the target. The logic discriminates between blinks, hunting eye movements and other characteristic positions and movements which are indicative of the subject having seen the target. Means also are provided to enable selective coarse or fine mapping of selected regions of the subject's visual field.

Claims11

Dependent claims

An apparatus for presenting a target image at various selected locations within a subject's visual field comprising:

a light source adapted to emit a beam of light;
a mirror:
means mounting said mirror with respect to said light source to reflect said beam, said means mounting said mirror being constructed and arranged to enable said mirror to be oriented in various selected attitudes with respect to said beam of light to selectively reflect said beam of light to said various locations;
electrically operable drive means connected to said means for mounting said mirror to effect said movement thereof;
circuit means having its output connected to said drive means for operating said drive means;
said circuit means including storage register means for storing digital information corresponding to a selected intended position of said drive means:
feedback means operatively associated with said drive means for developing a signal corresponding to the position of said drive means;
said circuit means including a comparator having inputs from each of said storage register means and said feedback means;
said circuit means including means responsive to the output of said comparator to operate said drive means when said input to said comparator are unequal thereby to move said mirror toward a selected attitude and for thereafter terminating operation of said drive means when said inputs to said comparator are equal.

6 more elements

An apparatus for presenting a target image to a subject and for recording the position of said target image comprising:

a housing having front and rear walls;
projection shutter means mounted to said front wall;
camera shutter means mounted to said rear wall.
a double faced mirror mounted within said housing between said projection shutter means and said camera shutter means;
projection light means supported within the housing and located with respect to said mirror to direct a first narrow beam of light along an axis toward one surface of said mirror and to reflect said first beam toward said projection shutter;
recording light means supported in said housing on the other side thereof for directing a second narrow beam of light along said axis and toward the opposite surface of said mirror to enable said second beam to be reflected toward said camera shutter means and in a direction which is opposite to that at which said light beam is reflected from said one surface of said mirror;
film mounting means disposed on said rear wall and on the other side of said camera shutter means;
means for orienting said mirror in selected attitudes thereby to vary the direction of each of said reflected first and second beams;
means for operating said projection light means and said recording light means independently of each other;
and
means for operating each of said projection shutter means and camera shutter means.

8 more elements

Dependencies are inferred from the claim text.

Objective plotting of visual fields by eye movement monitoring

Life of this patent

Objective plotting of visual fields by eye movement monitoring

Life of this patent

Abstract

Claims11