If you put someone in a room and asked them to distinguish between the HFA-II-i-series and the original HFA-II, they might have some trouble due to the fact they’re basically identical- or at least in appearance. Typically, when technology evolves, so does the design herein but then again we are talking about Carl Zeiss Ophthalmic after all. Fortunately, the newer i-series line-up offers some new exciting features, as well as modern data export solutions for EHR integration. The first thing you’ll notice is the substitution of a floppy drive for USB ports; no more backing up patient data on 1997 floppy disks. The second thing you’ll notice, is the HFA-II-i operates in almost exactly the same way– everything is familiar and how you would expect it coming off the prior HFA-II. It isn’t until we perform a test that we get to see Zeiss’ new GPA (Guidance Progression Analysis) with Visual Field Index software, and STATPAC-2 perimetry. These two software upgrades, along with the ability to export data with the DICOM gateway, is what you’ll gain over the traditional HFA-II. The 750i (just like the original HFA-II) comes with head tracking, and vertex monitoring as standard– something the 720, 740, and 750 do not– and carries all other features you’ll find in the latter unit models.
OUR TAKE: The gold standard in perimetry, fully loaded with all the options– now with Progression Analysis, and EHR capabilities. A great fit for a high-volume practice, that desires EHR connectivity.
#1. Head Tracking
The 750i, along with all HFA i models, included Guidance Progression Analysis (GPA) as standard. Enhanced Progression Analysis (GPA) software such as GPA identifies statistically significant progression automatically, and presents “at a glance” visual field progression analysis in a single page report. This accurately differentiates progression of visual field loss from random variability. The analysis is based upon detailed empirical knowledge of the variability found at various stages of glaucomatous visual field loss through information acquired in extensive multi-center clinical trials worldwide. We find GPA quite helpful; even with electronic patient charts it is difficult to really evalature field testing side-by-side. The HFA’s software however does it quite neatly and well for that matter.
See an example GPA printout here >
#2. DICOM Gateway for EHR
With the i-series HFA comes the ability to transfer visual field results to your EHR, network, or directly into Carl Zeiss’ FORUM software. This is all made possible by the HFA’s DICOM compatible gateway which send data from the application software directly to DICOM devices for viewing anywhere. The HFA can also connect directly to your network, or be backed up via USB drive.
#3. The Most Advanced HFA
The 750i, includes all the perimetry features the lesser models provide, with the addition of:
- Head Tracking
- Vertex Tracking
- Blue-on-Yellow Perimetry
- Kinetic Testing
*all software features standard on the 750
Head/Vertex tracking allows the operator to truly walk away from the device as the test is delivering and still get reliable results. If the patient takes their head away, it will notify the technician. During the test, the 750i’s user-interface displays a real time video of the eye (and takes pupil measurement) allowing near perfect alignment of the patient prior, and during the test. The 750i also maintains features seen in lesser units, including red-yellow-blue perimetry, and Gaze tracking.
Blue-on-Yellow Perimetry (B-Y), also known as Short Wavelength Automated Perimetry (SWAP), can detect early visual field loss before a reduction in differential light sensitivity is seen with standard white-on-white (W-W) perimetry since there is an association between glaucoma and short-wavelength (blue) color vision deficits. SWAP is standard on the HFA-II 750i.
We include a HP Laserjet 6C Printer with the purchase of the HFA unit. You can add a double top table to your purchase using the variations options prior to checking out.
It depends on the test, however most full threshold tests on HFA units take anywhere from 3-6 minutes per eye. The STATPAC-2 perimetry software is the same as what’s used on non-i units.
In general, the HFA units are relatively patient friendly however most do not dream of visual field testing. Elderly patients may find it difficult to maintain gaze, however the machine reads and understands this through false-negatives.