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The operation of the instrument occurs with clear text; elements are used which are known from the PC world such as:
- Dialog box > Dialog window, divided into logical items
- Entry boxes > Enter information using the keyboard or change by incrementing or decrementing
- List boxes > Select parameter from a displayed list
- Buttons (on/off/toggle) > Options activated by pressing a button
- Buttons (with symbols) > Initiate functions
In order to perform examinations with the Octopus 301 and analyze the results, only a few items have to be entered or manipulations made when configuration and setup has been correctly carried out. It will prove valuable to study the following chapter in order to work with the instrument efficiently.
- The options are selected which are shown in the window of a dialog box
- A function is activated when the associated button is pressed.
- For alphanumeric information, a keyboard is displayed automatically or the values are changed by incrementing or decrementing.
- Before the box is closed the selected changes must be stored.
Presetting for Preparing an Examination
- Additional patient information when preparing an examination
- Desired examination program
- Layout of the Four-in-One printout
Careful examination preparation helps increasing the reliability of the results. The patient should be informed about the examination process so he or she can cooperate optimally.
During the entire examination the patient concentrates on the fixation target which is displayed in the center of the field of view.
At various locations in the field of view stimuli (flashes of light) of a certain duration and intensity are shown. The patient acknowledges that he or she perceives the stimulus by pressings quickly on the patient response button.
Perception of the Stimuli:
It is normal that the patient is unable to see many stimuli. The number depends on the selected examination strategy and the condition of the patient’s visual field.
Duration of the Examination:
The duration of the examination depends on the selected examination program and the examination strategy and can range from roughly 3 to 15 minutes.
Stopping the Examination Process:
By closing the eye being examined or holding the patient response button down the patient can stop the examination process.
The time between two successive stimuli varies according to the instrument settings and the patient response speed of the patient. It can range from roughly 1.5 to 4 seconds.
Examinations or examination preparation are always accessed via the ‘Examine’ symbol. Before an examination can begin, a few items must be entered.
- Personal patient data
- Program parameters
Fine Positioning, Focusing:
The fine positioning of the eye to be examined takes place via the arrow buttons on the Touch module. For larger horizontal movements the optical unit can be turned manually. Position the pupil precisely on the crosshairs and focus the display of the eye with the adjustment knob of the optical unit.
- Switch to the examined test locations.
- Switch to the eye being examined.
- Fine horizontal positioning.
- Fine vertical positioning.
Defining the Variants of the Standard Examination Programs:
The G1, 32, M2, ST and LVC examination programs are built into the Octopus 301. For each of these programs three variants (1), (2) and (3) can be defined and stored as buttons P-V1, P-V2 and P-V3.
The analysis of the examination results consists of:
- Displaying results on the monitor
- Printing results
- Transmitting results to evaluation software on a PC
- Changing certain data
- Deleting results
The functions are always accessed via the ‘Analysis’ symbol and the examinations are selected from the examination file.
List of the completed or interrupted examinations.
Table of contents consisting of:
- ID number
- Date of birth
- Examination program
- Examination date
- Examined eye
- Examination status
Displaying the Results:
Select examination(s) in the examination file and press the ‘Display’ tab. The type of image which has been defined in setup will be displayed on the monitor.
The possible images depend on the examination programs which have been performed or the selected examination parameters.
Select one examination in the examination file and press on the ‘Edit’ tab and the ‘Change’ button. As when preparing an examination there exists a dialog box with personal patient data and a further one with eye-related data.
Corrections are possible for
- personal patient data
- eye-related data
Corrections are not possible for
- program-specific data
- the examined eye
Touch Screen Calibration
Two ways to calibrate the touch screen are available. It is of course wise to try to carry out calibration by using the built-in service function (refer to section b)). If access to this screen is not possible, start calibration following the procedure in section a).
a) Touch screen calibration with hidden function
− Switch perimeter off and on again and wait for the main screen.
− Press patient response button and headrest sensors simultaneously and wait for confirmation (3 beeps).
− Touch one corner of the screen by pen and confirm by pressing the patient response button (2 beeps).
− Repeat this step with the 3 remaining corners.
− Enter service function, repeat calibration and save parameters (refer to section b)).
b) Touch screen calibration with service function (normal case)
- Press ‘Start’ button.
- Touch one corner of the screen by pen and confirm by pressing the patient response button (2 beeps).
- Repeat step 2 with the three remaining corners.
- Press ‘Verify’ button and check at any screen position, if cursor follows the pen.
- Save parameters if calibration is acceptable, otherwise press ‘Start’ and repeat procedure.