Visual field testing is an important tool to detect and monitor blind spots caused by glaucoma.
Thanks to new developments, it is now possible to do faster and more reliable visual field testing. Visual field testing can be determined in 10 minutes or less per eye, in most cases.
The size of your visual field is the furthest you can see to the side when looking straight ahead. This test is important to make sure there are no abnormal blind spots in your visual field.
Automated Visual Field Testing
This test is usually conducted by a technician who is trained to help you get the most accurate reading possible. While you are seated comfortably, the technician will ask you to look straight ahead at a central target directly in front of you. You will be instructed to press a buzzer when you become aware of a small light to one side, within your peripheral field. It is important that you keep your eyes focused on the central target throughout this examination so the technician can get an accurate reading of your complete visual field. To get the best results, you must be alert and concentrate on the central target. Once the results from this test are printed out by the computer, your eye doctor can easily detect blind spots in your visual field.
If a field test reveals an abnormal, the doctor may retest certain areas of your visual field using a computer. The printed results of this test will help the doctor verify the first test was correct. To confirm a blind spot , the computer may recheck an area several times. It is best to relax and do your best.
Zeiss-Humphrey Field Analyzer II 750i
A New Dawn in Visual Field Testing
750i, The Gold Standard
Validated by decades of research and clinical experience, HFA is the accepted standard of care in glaucoma diagnosis and management.
Blue-yellow perimetry, also known as Short Wavelength Automated Perimetry (SWAP), represents a recent and exciting advance in the early identification of glaucomatous visual field loss. It differs from standard automated static perimetry only in that a carefully chosen wavelength of blue light is used as the stimulus, and a specific color and brightness of yellow light is used for the background illumination. Except for these differences, blue-yellow perimetry is still a basic threshold perimetry test, in which standard Goldmann stimuli are presented in the conventional way.
The Humphrey Field Analyzer II-i series is a wheelchair accessible, computerized perimeter used to examine the patient's visual field. By using SITA™, the expert operating systems threshold testing time is reduced by up to 70%. A patented aspherically shaped bowl provides a compact, ergonomic design to increase patient comfort while testing out to 90º. A video eye monitor enables the operator to align and track patient eye position. Gaze tracking provides real time evaluation of eye fixation
What Clinical Studies Have Shown
"Blue-on-yellow perimetry deficits are an early indicator of glaucomatous damage and are predictive of impending glaucomatous visual field loss for standard white-on-white automated perimetry." Chris Johnson, PhD, et al.1 "Preliminary findings suggest that SWAP may be useful in detecting certain neuro-ophthalmologic deficits more readily than standard automated visual field testing, especially for optic neuritis and multiple
John L. Keltner, MD, et al.