Procedure

Let’s take a moment to review what the procedure would look like for the Humphreys field analyzer and also for the Octopus visual fields instrument. These instruments often require the use of trial lenses. So, first it will have you enter the patient data, it will have you select calculate trial lens and it will populate some trial lenses for you to gather. Make sure you’re entering the patients most recent distance prescription into the device. Make sure to get trial lenses for both the right and the left eye. And then also remember, spherical lenses are clear lenses and cylinder lenses generally have the axis indicated by red lines. Red lines also indicate that these are in minus cylinder form.

Go ahead and pull out the trial lens holder, place the cylinder lens first and align the axis, then you’ll put the sphere lens in place and push the trial lens holder back into position. We’ll start the test with the right eye, as always, so you’ll patch the left eye. Align the table height to a comfortable position for the patient as proper alignment can minimize artifacts in the visual field report. Have the patient place their chin on the left chin rest to properly align the right eye. Use the arrows to align the chin rest so that the forehead is against the machine and the pupil is centered in the cross hairs. Ensure that the patient is comfortable and remind them that this test can be a little bit longer. Pull the trial lens holder as close to the patient’s eye as possible without touching their eyelashes. Instruct the patient to maintain focus on the fixation target. Remind them that they may blink normally, that they may notice you adjust their position throughout the duration of the test; to also let you know if they need a break, and that they may hold down the clicker to pause the test at anytime. Initiate the eye tracking by starting the test. It will prompt you to proceed with the test once the device has completed the tracking. Once the test has completed, have the patient sit back and pull forward the trial lens holder, remove the trial lenses and insert the trial lenses for the left eye and push the holder back temporarily. Have the patient switch the patch from their left eye to their right eye. Have the patient rest their chin on the right chin rest and pull the trial lens holder close to their left eye. Again, without touching their eyelashes, proceed with the screen prompts for tracking and begin the test. Remind the patient that this is a threshold test, this is meant to show and produce lights that may be out of normal range, so not to worry if they feel like they are missing a flash of light, that’s okay. Monitor the pupil and engage and encourage the patient through the duration of the test.