Ergonomic and patient-friendly
The OCULUS Easyfield® is a full-fledged compact perimeter capable of performing standard automated perimetry of the central visual field up to 30° eccentricity. It has been designed for the combined use as visual field screener and perimeter, offering features usually available only in large units. The spherical bowl with 30 cm (11.81”) radius is enclosed into an ergonomically movable cone equipped with a distance adapted lens. The Easyfield® conforms to the Goldmann
standard and fulfills the ISO-12866 norm for perimeters.
Measurements of the Easyfield® are carried out using an LED grid with 135 fixed test locations, including the common 30-2, 24-2 and 10-2 patterns. The novel SPARK test strategy leads to faster and more stable threshold tests providing improved diagnostic capabilities. Besides the standard field indices the Easyfield® delivers evaluations of the innovative Glaucoma Staging Program (GSP) and the classifications provided by the Glaucoma Staging System (GSS 2).
Functions
Ergonomic Design
One of the most striking features of the Easyfield® is its small space requirement. The self-contained design and light-shielded viewer enable examinations to be conducted in normal room lighting conditions. Its robustness and low weight make the Easyfield® Perimeter ideal for portable use. The lack of moving device parts guarantees long product life.
- The redesigned double head rest with translucent lateral eye shields allows measurements without an eye-patch, saving precious time in the preparation for the test.
- The completely new, vertically adjustable chin rest (Easyfield® C only) improves the quality of examinations by sensibly increasing the comfort of the patients.
- The stylish design of the chin rest is adapted to the ergonomically movable perimeter cone for complete versatility
Easy Operation
The Easyfield® Perimeter can be controlled via an external computer (Notebook or PC). The familiar user interface of the OCULUS programs is available on the computer and you can enjoy the full freedom of networking the examination data. The use of translucent Easyfield® occluders allows you to conduct examinations without the usual eye patch, thus saving you valuable time as you prepare for the examination.
Increased Diagnostic Reliability
Additional software programs improve the diagnostic value of visual field examinations conducted with the Easyfield® Perimeter. The Glaucoma Staging System (GSS 2) per Dr. Brusini and the Glaucoma Staging Program (GSP) are Glaucoma risk indicators. The Threshold Noiseless Trend (TNT) is used for efficient progression analysis.
The Examination Programs
The Easyfield® provides pre-defined programs for the examination routines that are most frequently used. Measurements of the central visual field or the macula area are thereby conducted. This program series can be extended, if necessary, by interlinking available test grids and test strategies.
The OCULUS Test Strategies
As a screening unit, the Easyfield® Perimeter generally uses threshold related suprathreshold examination strategies. The advantage of this is that despite the short examination time, the examiner gains a meaningful overview of the examined area.
The OCULUS Test Point Grid
The Easyfield® Perimeter’s fixed light emitting diode grid permits examination in areas such as the 30-2, 24-2 or 10-2. It is also possible to test individual hemispheres or quadrants. If necessary, individual points can be examined in any combination. The modular setup of the test programs allows all areas to be examined using all available standard strategies.
Results Printout
The measuring results of the Easyfield® Perimeter are summarized in a standard printout. For suprathreshold tests, only a single informational overview is printed, whereas for threshold examinations, all clinically relevant data are recorded and shown in various depictions.
Attachable correction lens holder
A spring-loaded double mount offers increased stability for the correction lens holder.
Standard Automated Perimetry
Screening
Screening with the Easyfield® is most commonly carried out by performing supra-threshold examinations of the central visual field. During these examinations the presented stimulus is always brighter than the one matching the normal threshold value corresponding to the patient’s age in the given location. Screening programs have shorter duration and are easier to complete. As a result, an overview of the visual field is obtained, without numerical dB values, but with the identification of peculiar locations. The Easyfield® employs threshold oriented suprathreshold strategies with 2 or 3 zones, recognizing defects or absolute and relative defects, respectively. The predefined “Screening 24-2” program uses a 2 zones strategy and takes slightly more than a minute per eye to accomplish. Customized screening programs using different test patterns or strategies can be easily created in the device software, with the possibility to adapt to any special requirement.
Threshold measurements
The most complete information about the visual field can be obtained by determining sensitivity threshold values in all locations of a test pattern using strategies for threshold measurements. The Easyfield® perimeter offers various threshold measurement procedures:
- Full Threshold: The classical 4-2 dB staircase strategy using two reversals in the patient’s answer to deliver a threshold value
- Fast Threshold: Bracketing strategy using variable steps and taking advantage of already measured locations.
- CLIP1): Strategy using stimuli with continuously increasing luminance. Threshold value is assigned the moment the stimulus is perceived.
- SPARK2): Fast and averaged threshold strategy based on statistical correlations between threshold values measured in different locations.
1) CLIP – Continuous Light Increment Perimetry
2) SPARK is not an acronym, the name of the strategy was inspired by the appearance of the stimuli during perimetry
Focus on Glaucoma
Measurement – Assessment – Progression
Speed, precision and reliability: the SPARK threshold strategy
Defect assessment: Glaucoma Staging System (GSS 2)
Beyond field indices: Glaucoma Staging Program (GSP)
Efficient progression analysis: Threshold Noiseless Trend (TNT)
- SPARK Precision is the full-fledged version of SPARK. Comprehensive visual field examinations of glaucoma patients can be performed in just 3 minutes per eye. Averaging the results over all four phases ensures a high degree of reliability and reproducibility for improved progression analysis.
- SPARK Quick is the perfect strategy for follow-up and screening examinations. The procedure only takes 90 seconds per eye.
- SPARK Training is ideal for patient training. This 40-second measurement can also be used for screening.
- The SPARK strategy is fine-tuned for use in clinical examinations of glaucoma patients.
GSP assigns each test result to a visual field class using an algorithm optimized to match evaluation by a glaucoma expert. In addition, the database of GSP includes correlations with the whole clinical picture (including structural changes). This information enables GSP to evaluate the degree of risk for the presence of different glaucoma stages on the basis of visual field findings.
Intuitive green-yellow-red colour coding helps in fast and reliable interpretation of the findings. The striking novelty of GSP consists in its capability to identify both glaucoma suspect patients and patients with possible pre-perimetric glaucoma using nothing but measured threshold values.
- TNT displays a concise report of the progression analysis with a summary of the most relevant parameters (MD slope, p-values, etc.).
- TNT can distinguish between cases of diffuse or focal progression based on the value of the “Focality Index” (FI).
- TNT uses multiple statistical criteria in establishing progression.
- TNT presents age-related predictions on the visual field.
Title
Description
3) M. González de la Rosa, J Glaucoma 2012
4) P. Brusini, S. Filacorda, J. Glaucoma (2006) 15: 40–46
5) D. Wroblewski et al, Graefes Arch Clin Exp Ophthalmol 2009
6) M. González de la Rosa and M. González-Hernandez, Br. J. Ophthalmol. 2011; V.T Diaz-Aleman et al., Br. J. Ophthalmol. 2009
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Technical Data
Programs | Pre-defined glaucoma, macula, screening and neurological tests User-defined tests |
Strategies | Threshold strategies: SPARK Quick, CLIP, OCULUS Fast Threshold, Full Threshold (4/2) Optional: SPARK Precision Age adapted suprathreshold screening (2-zone, 3-zone, quantify defects) |
Test patterns | 30-2, 24-2, 30×24, 10-2, hemisphere, customized patterns |
Reports | Glaucoma Staging System (GSS2), Glaucoma Staging Program (GSP), Threshold Noiseless Trend (TNT) progression report |
Fixation control | Through central threshold, Heijl-Krakau (using the blind spot), live video image |
Result Display | Greyscale, dB values (absolute / relative), symbols, probabilities, 3D plot |
Perimeter bowl radius | 300 mm |
Stimulus size | Goldmann III |
Stimulus luminance range / increments: | 0.03 – 3 180 cd/m² (0.1 – 10 000 asb) / 1 dB |
Stimulus duration: | 200 ms / user-defined |
Background luminance: | 10 cd/m² (31.4 asb) |
Stimulus color | White |
Max. eccentricity | 30° |
Patient positioning: | Measurement head with adjustable angle of inclination, adaptable chin rest (Easyfield® C only), double head rest |
Dimensions (W x D x H) | Easyfield® S: 274 x 370 – 470 x 314 – 429 mm (10.8 x 14.6 – 18.5 x 12.4 – 16.9 in) Easyfield® C: 316 x 506 – 540 x 320 – 435 mm (12.4 x 19.9 – 21.3 x 12.6 – 17.1 in) |
Weight | 7,4 kg (16.3 lbs) / 4,6 kg (10.1 lbs) |
Voltage, Frequency | 100-240 V AC 50 – 60 Hz |
Interface | USB |
Software | Device control, patient management, backup, and print software (Windows®) Built-in networking, easy EMR-integration, DICOM compatibility |
Recommended computer specifications | Intel® Core™ i5, 4 GB memory, 500 GB HDD, 8 GB RAM, Intel® HD Graphics, Windows® 10 |
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