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Easyfield®

The smallest full-fledged perimeter on the market

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Easyfield®

The OCULUS Easyfield® is the smallest full-fledged perimeter on the market. It is designed for use as a visual field screener and as a threshold perimeter for immediate re-examination of any abnormal findings. Ideal for all common examinations of the central visual field up to 30°. The Easyfield® C has an adjustable double chin rest and uses translucent eye shields for maximum patient comfort.

OCULUS Easyfield® - Automatikperimeter für statische Gesichtsfelduntersuchungen

Functions

Ergonomic Design

One of the most striking features of the Easyfield® is its small footprint. Its compact design and light protected bowl enable examinations to be performed in rooms with normal lighting conditions. The perimeter is robust and light-weight, making it well-suited for portable use. The absence of moving device parts guarantees prolonged product lifetime.

Easy Operation

The Easyfield® perimeter is operated via an external computer (notebook or PC). You can enjoy the full freedom of networking the examination data with the familiar user interface of the OCULUS programs. The use of translucent eye shields allows you to conduct measurements without the usual eye patch, thus saving you valuable time of preparing examinations.

Increased Diagnostic Reliability

High stability test strategies like SPARK and additional assessment tools improve the diagnostic value of the Easyfield® perimeter. The enhanced Glaucoma Staging System (GSS 2) of Dr. Brusini and the Glaucoma Staging Program (GSP) expert systems offer extended support in the single field analysis. The Threshold Noiseless Trend (TNT) carries out efficient progression analysis. Examination quality is ensured by a patented fixation control algorithm, a high resolution video camera for eye monitoring and the various built-in catch trials.

Examination Programs

The Easyfield® comes with a set of predefined programs for most frequently needed examination routines of the central visual field or the macular area. The program list can be easily extended according to specific requirements by combining the available test patterns and test strategies.

OCULUS Test Strategies

As a screening unit, the Easyfield® perimeter generally uses threshold related suprathreshold examination strategies. These have the advantage of providing the examiner with a meaningful overview of the tested area despite the short examination time. Multiple test strategies are available for evaluating the accurate numeric values of the sensitivity thresholds. The OCULUS “Fast Threshold” reduces test duration by implementing clever improvements of the classic 4-2 step method. The CLIP strategy achieves a similar performance using a new type of stimulus presentation. The novel and unique SPARK strategy provides rapid and reproducible threshold measurements specifically developed for glaucoma patients.

OCULUS Test Patterns

The fixed grid of light emitting diodes of the Easyfield® perimeter allows examination of the common 30-2, 24-2 or 10-2 patterns. It is also possible to test individual hemispheres or quadrants. If necessary, any combination of individual points can be examined. The modular structure of the test programs allows for all patterns to be examined using any available standard strategy.

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 is shown in distinct depictions.

Videos

Easyfield® C – Automatic perimeter up to 30° eccentricity

The Software

SPARK Threshold Strategy: Enjoy Speed, Precision, and Reliability
Glaucoma Staging System (GSS 2)
Glaucoma Staging Program (GSP)
Threshold Noiseless Trend (TNT) Progression Analysis

The SPARK strategy is based on statistical relationships between threshold values found for different locations in the glaucomatous visual field. These relationships have been derived from more than 90,000 perimetric examinations, providing high statistical significance and allowing for fast and very precise threshold measurements in the central visual field. The four-phase structure of SPARK makes it a versatile tool for clinical practice:

  • 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.

The enhanced Glaucoma Staging System (GSS 2) of Brusini classifies visual field defects based on the perimetric indices MD (Mean Deviation) and PSD (Pattern Standard Deviation). The representative point of the examination is placed in a chart according to the values of these indices. The chart displays defined areas for the different stages of disease (Stage 0 – Stage 5) and separates generalized, localized and mixed defects.
The Glaucoma Staging Program (GSP) is based on pattern recognition and is dedicated to early detection of glaucoma.

The GSP software places examination findings into visual field classes (normal, glaucomatous, artifactual and neuro) based solely on their appearance. In addition, risk classes (normal, suspect, pre-perimetric, early stage, moderate and severe) are also assigned to findings that are classified as normal or glaucomatous. The evaluation results are presented in intuitive green-yellow-red color coding.

The striking novelty of the GSP is its ability to detect subtle changes in the visual field associated with early stage glaucoma. Findings of suspect and pre-perimetric risk classes may contain reductions in the visual field that cannot be readily seen by the examiner. They usually remain undetected also by standard perimetric indices.

The Glaucoma Likelihood Index (GLI) summarizes the results of the GSP classification into a single parameter presenting a value between 0 (normal) and 5 (severe glaucoma).

The Glaucoma Staging Program (GSP) is available for OCULUS Twinfield® 2, Centerfield® 2 and Easyfield® perimeters. This upgrade is available for the existing units.

TNT provides a quantitative, statistical analysis of the visual field examinations conducted over time. For follow-up purposes the software uses all visual field results taken over the entire observation period and takes the patient's threshold values into account obtained on the 30-2, 30x24 or 24-2 patterns. TNT uses a specific filter to reduce the fluctuation range of the threshold values and to perform a consistent trend analysis. In conjunction with the fast SPARK strategy, the sensitivity of detecting progression in early stage glaucoma is greatly improved.

  • TNT creates a concise progression analysis report containing the most important parameters (MD increase, p-values, etc.).
  • TNT can differentiate between diffuse and focal progression based on the focality index (FI) value.
  • TNT applies multiple statistical criteria to establish possible progression.
  • TNT displays the prognosis of the expected visual field for a patient age-group selected by the examiner.

Device
SPARK Threshold Strategy: Enjoy Speed, Precision, and Reliability Glaucoma Staging System (GSS 2)  Glaucoma Staging Program (GSP) Threshold Noiseless Trend (TNT) Progression Analysis

Title

Description

FAQ

There are four models in the OCULUS perimeter range. All four models can perform screening (supra-threshold) and threshold perimetry. Apart from being various sizes they differ as follows:

Model Easyfield® Smartfield Centerfield® Twinfield®
Maximum Eccentricity 30° 30°/25°
With fixation shift: 60°/50°
36°
With fixation shift: 70°
90°
Goldmann stimulus size III III III I, III & V
Static/Kinetic Static Static Static/Kinetic Static/Kinetic
Color perimetry White-white White-white White-white
Blue-yellow
White-white
Blue-yellow
Red-white
Stimulus presentation Light emitting diodes (LED) LCD display Back surface projection Back surface projection
All commercially available perimeters make use of the same basic testing principles. What makes one perimeter different to another is the way it performs fast thresholding test. Various fast threshold strategies are included in the OCULUS perimeters, one of which is the SPARK strategy – currently the fastest OCULUS strategy for glaucoma patients. It is the product of many years of research dedicated to obtaining reliable averaged results within the shortest possible time.

Furthermore all the perimeters include a unique glaucoma staging display called the Glaucoma Staging Program (GSP).

Lastly glaucoma progression is monitored by the Threshold Noiseless Trend (TNT) analysis method. The method can distinguish between diffuse or focal progression, and unlike methods based on event analysis, trend analyses make full use of the data pool of earlier examinations.

Yes, it may differ somewhat in appearance, but all the essential data known from other perimeters is available on the OCULUS perimeter printouts.
  • Full Threshold (4-2 dB Staircase) Strategy – the algorithm of this strategy can easily be implemented in any instrument and therefore it is available on most commercial perimeters. Results obtained with this strategy can be compared to results from any other perimeter using the same strategy.
  • OCULUS Fast Threshold Strategy – this strategy aims to reduce test time of the 4-2 dB Staircase strategy. The idea of the OCULUS Fast Threshold Strategy is to achieve a compensating gain in information by starting the measurement at each test point with a luminance value equal to the expected sensitivity value at that point. This expected value is calculated on the basis of measurement results already obtained at neighbouring test points.
  • CLIP (Continuous Light Increment Perimetry) Strategy – locations are tested individually by increasing the luminance of the stimulus continuously until the patient responds.
  • SPARK – the examination is performed in four phases. Each of these phases supplies a possible estimation of the functioning of the entire visual field, and the final result is obtained by averaging of the values obtained during each phase.
Yes. SPARK Precision is performed in four phases over a time period of three minutes. Each of the 66 points in the test pattern will be tested at least once during the three minutes.
Shorter examination time and better repeatability are the main benefits of SPARK. Testing time for this strategy will not exceed three minutes and this holds true even for patients with severely impaired visual field function. Compared to other known strategies, SPARK results have a much lower variability.
Various quick screening methods are available. Normally supra-threshold tests are used, however SPARK Quick has been designed specifically with screening in mind. The duration of the test is 1.5 minutes (90 seconds) on all patients and threshold values are generated after the examination.
Most perimeters only have Heijl-Krakau method to monitor patient fixation. This method uses the blind spot as reference. Glaucoma can cause absolute defects in the vicinity of the blind spot, which may increase as the disease progresses. Using the Heijl-Krakau method for these patients may be problematic. Central fixation control – only available in the OCULUS perimeters – uses the central luminance threshold as reference. This is a helpful method to control fixation for glaucoma patients.
All OCULUS perimeters allow for manual set-up of programs. When comparing current results from an OCULUS perimeter with previous results from other perimeters it is important to adapt the parameters of the current examination as closely as possible to those of the earlier examinations. This needs to be done in order to achieve the highest degree of comparability.
Examinations on the Easyfield®, Smartfield or Centerfield® can be performed in a normally lit room, provided the lighting is diffuse and there are no powerful light sources in the patient’s back. The Twinfield® requires a darkroom, as its perimetric hemisphere must be free of shadows.
GSP uses pattern recognition algorithms in order to assess the visual field results of the patient. For “Normal” and “Glaucomatous” visual fields a risk class can be determined by comparing the detected patterns to the visual field patterns stored in the database of the GSP. If the “Pre-perimetric” risk class dominates the bar chart, it means that the pattern of the measured visual field is similar predominantly to the patterns of patients with pre-perimetric glaucoma from the database. Pre-perimetric glaucoma is defined through glaucomatous changes to the optic nerve head and/or the retinal nerve fibre layer without detectable visual field losses. A “Pre-perimetric” result should be followed by a closer monitoring of the patient.
The software automatically chooses exams done with the same test pattern and the same strategy making comparison fast and easy to detect progression. Exams showing obvious learning effects are excluded by the software. The operator can also manually exclude exams if needed.

Technical Data

Static Perimetry

Programs Pre-defined glaucoma, macula, screening and neurological tests
User-defined tests
Test patterns 30-2, 24-2, 30×24, 10-2, hemisphere, customized patterns
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)
Examination Speed Adaptive, fast, normal, slow, user-defined
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
Reports Glaucoma Staging System (GSS2), Glaucoma Staging Program (GSP), Threshold Noiseless Trend (TNT) progression report
Specifications

Perimeter bowl radius 300 mm
Max. eccentricity 30°
Stimulus size Goldmann III
Stimulus color White
Stimulus duration 200 ms / user-defined
Stimulus luminance range / increments 0.03 – 3 180 cd/m² (0.1 – 10 000 asb) / 1 dB
Background luminance 10 cd/m² (31.4 asb)
Patient positioning Measurement head with adjustable angle of inclination, adaptable chin rest (Easyfield® C only), double head rest
Software Device control, patient management, backup, and print software (Windows®)
Built-in networking, easy EMR-integration, DICOM compatibility
Interface USB
Technical specification

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 Easyfield® S: 4.6 kg (10.1 lbs)
Easyfield® C: 7.4 kg (16.3 lbs)
Max. power consumption 26 W
Voltage, Frequency 100-240 V AC
50 – 60 Hz
Recommended computer specifications Intel® Core™ i5, 4 GB memory, 500 GB HDD, 8 GB RAM, Intel® HD Graphics, Windows® 10

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