FG ELETTRONICA

HESS LANCASTER'S TEST

The Hess-Lancaster scheme is a test in which is used to detect the presence of anomalies in the functioning of muscles responsible of ocular motility. Based on this assessment, in fact, the doctor determines the origin of a paralysis of the eyeballs, the diplopia or strabismus.

In strabismus is useful for evaluating the type of ocular motility, particularly in research, when the variations of the muscular actions vary as in postural disorders, also associated with dental occlusion alterations and to proprioception dent alveolar paradental and articular thus determining the entity the deviation above and, the state
of the muscles affected by the problem, as well as providing immediate evaluation in connection with introductions of iatrogenic disturbing stimuli for diagnostic purposes.

To perform Hess-Lancaster the classic examination, the patient wears a pair of glasses that has the red right lens and the left green, and is accomodated in front of a squared screen
over which the medical projects the red light of a torch, while the patient used another to green light. The test requires the patient overlaps the green light of his torch to the red projected
by the doctor on the squared screen.

On completion bringing together points 'seen' by the patient on the screen, you'll get a more or less regular shape square from which the doctor will extrapolate its diagnosis and then treatment to be followed for the correction of diplopia / squint.
The instrument 'Hess' Screen automates this process by means of a special control SW, which allows to optimize the examination eliminating human errors due the manual dexterity of the old measurement method, also the data are captured and digitized, and then managed in electronic means for more effective and safe management of examinations.
To perform the diagnostic test, the 'Hess Screen' tool uses a high-resolution projector controlled by a computer and related SW, which projects a series of points (mire) bright red, according to the Hess-Lancaster scheme, and simultaneously , driven by the patient using a device of the computer mouse type pointing, touch pad, joystick, or other, depending on the manual and / or type of patient, it projects the bright green dot to superimpose the red sight.

When the patient will see the two red and green mire overlap, will store with a simple press of a button the position.
At the end of the sequence of points, the SW will analyze the collected data and will propose to the orthoptist, in addition to the Hess-Lancaster diagram printing with marking of detected points, a table of deviation error, expressed in diopters,
that will help the doctor to the determination of diagnosis (which remains of medical liability).

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