IFA-900 / IFA-950 / IFA-960 Front Projection Perimeter
The ENOCHTEC IFA series is a front-projection automated perimeter for white-on-white threshold, screening and, on the top model, kinetic visual field testing. One independent LED light source and a rotating optical system project every stimulus onto an aspheric diffuse bowl, so the light spot has the same intensity at any position. The IFA-900 covers the standard programs; the IFA-950 adds blue-yellow perimetry (SWAP), regional condensed tests and colored stimuli; the IFA-960 adds kinetic perimetry and further test programs. All three run on a dedicated embedded system with a 15-inch touchscreen.
IFA-900, IFA-950 or IFA-960?
The three models share the same bowl, light source, threshold strategies, fixation control and basic analysis. The differences are:
| Function | IFA-900 | IFA-950 | IFA-960 |
|---|---|---|---|
| White-on-white threshold and screening programs | ✓ | ✓ | ✓ |
| HISA, Full Threshold, Fast Ladder and Standard Threshold strategies | ✓ | ✓ | ✓ |
| Gaze tracking, blink control, pupil measurement | ✓ | ✓ | ✓ |
| VFI, GHT, single field analysis, serial field overview, glaucoma progression analysis | ✓ | ✓ | ✓ |
| Blue-yellow perimetry (T24-SWAP, T30-SWAP) and SWAP analysis | — | ✓ | ✓ |
| 100 cd/m² background and Goldmann I–V stimulus sizes | — | ✓ | ✓ |
| Regional Condensed Test (RCS-30, RCS-24) | — | ✓ | ✓ |
| Blue-stimulus colored perimetry, specialty patterns EM-M and EM-B, T30V-2 | — | ✓ | ✓ |
| Kinetic perimetry (standard, scotoma map, blind-spot map, static points, custom scan) | — | — | ✓ |
| RT30-2 and GT30-2 threshold programs, red and green stimuli | — | — | ✓ |
Front Projection: Uniform Stimulus Position and Intensity
A hidden-LED-array perimeter uses hundreds of LEDs at fixed positions as stimulus points. Differences between the LEDs and the thickness of their covering paint mean the intensity of different points can vary even after calibration. In a front-projection perimeter every stimulus comes from the same light source, so intensity does not depend on the test point or on the viewing angle. The diffuse surface is produced by chemical etching of the injection mould and can be cleaned with a damp cloth.
LED Light Source Without Routine Replacement
The IFA uses an LED light source rather than a halogen lamp. According to the manufacturer, the radiated energy of the LED falls by less than 20% after 30,000 hours of illumination; at about 300 stimuli per test and 200 ms per stimulus, the stimulus intensity changes by less than 1 dB after 1.8 million tests. A built-in light sensor monitors the intensity and reports abnormal changes. Halogen lamps, by contrast, need periodic replacement and manual calibration to keep the output accurate.
Standard White-on-White Perimetry
The IFA series uses a white stimulus on a 31.5 asb (10 cd/m²) background, the illumination standard used by mainstream projection perimeters, with Goldmann III stimuli from 0.08 to 10,000 asb (0–50 dB) at a 30 cm test distance. Threshold programs include T30-2, T24-2 and T10-2 for glaucoma, T-Macula for macular function, T60-4 and T60-2 for the peripheral field and T-NS for the nasal step. Screening programs include S-40, S-64, S-76, S-80, S-60, S-Armaly and S-NS, with two-zone, three-zone and quantified-defect strategies. The maximum temporal range is 90°.
HISA Threshold Strategy
The HISA strategy estimates the starting threshold of each point from neighbouring results and age-matched normal values, skips unnecessary presentations, adapts the stimulus interval to the patient’s response speed and retests points whose results look unreliable. This shortens examination time for both fast and slow responders without changing the test pattern.
Blue-Yellow Perimetry (SWAP) on the IFA-950 and IFA-960
Short-wavelength automated perimetry tests the blue-cone pathway with a blue stimulus on a bright 100 cd/m² yellow background. The IFA-950 and IFA-960 produce the blue stimulus with an independent blue LED, so the test can use the standard Goldmann III stimulus instead of the larger Goldmann V. They run T24-SWAP and T30-SWAP with the HISA-SWAP algorithm, so a blue-yellow test takes about as long as a standard test.
SWAP results show more variability than standard perimetry and are affected by yellowing of the crystalline lens, so SWAP is used alongside standard perimetry and structural imaging such as the OCT-500 spectral-domain OCT, not as a replacement. Interpretation remains the responsibility of the examining clinician.
Kinetic Perimetry and Regional Condensed Test
On the IFA-960, kinetic perimetry moves a light spot of chosen intensity and size from the periphery toward the centre; the patient responds when the spot is seen, and the response points outline the isopter. It supports standard kinetic testing, scotoma maps, blind-spot maps, static points and custom scans, and is useful for following changes in the field and differences between the two eyes.
In a standard 30-2 test the points are 6° apart, so a small early defect can fall between them. With the Regional Condensed Test (IFA-950 and IFA-960), the clinician selects an area on the touchscreen, based on the 30-2 result or on fundus and OCT findings, and tests it at 1°, 2° or 3° spacing (RCS-30 and RCS-24).
Fixation Control and Reliability
Gaze tracking monitors pupil position throughout the test: the system alerts the patient when fixation drifts, ignores stimuli presented during an eye movement and pauses the test if the shift persists. Stimuli missed during a blink are repeated automatically. Heijl-Krakau blind-spot monitoring, infrared video, false-positive and false-negative catch trials and a gaze-tracking curve help the clinician judge test reliability, and the pupil diameter is measured and printed on the report.
Analysis and HFA-Style Reports
Reports show numeric values, grayscale, total and pattern deviation with probability plots, the Visual Field Index (VFI), pattern standard deviation (PSD) and the Glaucoma Hemifield Test (GHT). The familiar HFA-style layout makes results easy to compare with other mainstream perimeters. Glaucoma progression analysis separates significant change from test-to-test variability across a series of follow-up fields.
Dedicated System, Storage and Networking
Instead of a general-purpose PC, the IFA series uses an embedded ARM computer with a dedicated operating system, which avoids common PC viruses and moving parts. More than one million test results are stored on at least 64 GB of solid-state memory, with backup to a flash disk, portable hard disk or network. The units connect to the network by Ethernet or WiFi, and reports can be exported as PDF or JPG files. The 15-inch touchscreen is angled toward the operator and shielded from the patient.
DICOM Connection (Optional)
With the optional DICOM configuration, the IFA retrieves the patient Worklist from the HIS or PACS, with name, sex and birth date filled in automatically. It reports the exam status to the HIS when a test starts and when it is completed (MPPS), and stores each report on the PACS as a PDF-encapsulated DICOM file, once per report. The AE titles, IP addresses and ports are set in the administrator menu, and a connection test confirms the link. DICOM is an option: confirm it when ordering.
IFA Series vs IVS Series
| IFA-950 / IFA-960 | IVS-201A | |
|---|---|---|
| Stimulus generation | Front-projection LED | Hidden LED array |
| Background / test distance | 10 cd/m², 30 cm | 10 cd/m², 30 cm |
| Blue-yellow perimetry (SWAP) | Yes | Yes |
| Kinetic perimetry | IFA-960 | No |
| Regional Condensed Test | Yes | No |
| Data storage | ≥64 GB | ≥32 GB |
| DICOM | Optional | Optional |
| Dimensions / weight | 56 × 49 × 60 cm / 28 kg | 56 × 49 × 60 cm / 25 kg |
Choose the IFA series when uniform front-projected stimuli, kinetic perimetry or regional condensed testing are required, and the IVS series for a hidden-LED-array perimeter with the standard programs. For a computer-based static perimeter, see the BIO-1000 Plus.
Where the IFA Fits in a Glaucoma Workup
- Intraocular pressure — with the ST-1000P non-contact tonometer or the RT-500 rebound tonometer.
- Corneal thickness — with the MD-1000P ultrasonic pachymeter, as a reference for IOP interpretation.
- Structure — optic nerve and RNFL imaging with the OCT-500.
- Function — visual field testing and follow-up with the IFA series.
Request a glaucoma equipment package quote.
What Should Buyers Confirm Before Ordering?
Confirm the model (IFA-900, IFA-950 or IFA-960), whether SWAP, regional condensed tests, kinetic perimetry or the optional DICOM interface are needed, the optional foot-pedal responder, keyboard and mouse, the interface and report language, installation space (56 × 49 × 60 cm, 28 kg) and the documentation required in the destination market. See the Visual Field Analysis & Perimetry range for related equipment. The final supply configuration is confirmed in the written quotation.
What Affects the Price of a Perimeter?
The price depends mainly on the model — IFA-900, IFA-950 or IFA-960 — plus optional accessories, the DICOM interface, language and documentation for the destination market, and shipping terms. Including these points in your enquiry allows an accurate, comparable quotation.
Frequently Asked Questions
What is the difference between the IFA-900, IFA-950 and IFA-960?
All three share the same hardware and core programs. The IFA-950 adds blue-yellow perimetry (T24-SWAP and T30-SWAP), regional condensed tests, blue-stimulus perimetry and specialty patterns. The IFA-960 adds kinetic perimetry, the RT30-2 and GT30-2 programs and red and green stimuli.
What is the difference between front projection and a hidden LED array?
A front-projection perimeter projects every stimulus from one light source onto a diffuse bowl, so intensity is the same at every test point. A hidden LED array uses many LEDs at fixed positions, whose output can differ slightly between points. Both are used for standard threshold perimetry; the IVS series uses a hidden LED array.
Which visual field programs are included?
Threshold programs T30-2, T24-2, T10-2, T-Macula, T-NS, T60-4 and T60-2, plus screening programs such as S-40, S-64, S-76, S-80, S-60 and S-Armaly. The IFA-950 and IFA-960 add T24-SWAP, T30-SWAP and T30V-2; the IFA-960 adds RT30-2 and GT30-2.
Does the IFA support DICOM?
Yes, as an option. The IFA retrieves the patient Worklist from the HIS or PACS, reports the exam status and stores each report on the PACS as a PDF-encapsulated DICOM file. It connects by Ethernet or WiFi and can also export reports as PDF or JPG. Confirm the DICOM option when ordering.
Does the IFA need a separate computer?
No. It runs on a built-in embedded system with a 15-inch touchscreen; a keyboard and mouse are optional.
What power supply does it need?
100–240 V, 50–60 Hz, about 100 VA, so the same unit works on 110 V and 220 V mains.