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.
One of the most striking features of the Easyfield® is its small footprint. Compact design and light-protected viewer enable examinations performed in rooms with normal lighting conditions. Its robustness and low weight make the Easyfield® perimeter convenient for portable use. The absence of moving device parts guarantees prolonged product lifetime.
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.
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.
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.
The SPARK examination strategy was primarily developed for Glaucoma patients and is available for all OCULUS perimeters. It is based on data from more than 90,000 perimetric findings and allows a very fast, yet very precise measurement of thresholds in the central visual field. The modular structure of the method makes it suitable for a variety of applications:
- SPARK Precision (optional software) is the full version of SPARK. The complete visual field examination of glaucoma patients takes only 3 minutes per eye. The greater stability of the results allows for more sensitive progression analysis.
- SPARK Quick is used for follow-up or screening examinations. The test takes just 1.5 minutes per eye.
- SPARK Training is ideal for patient training. The 40 second measurement can also be used as a screening examination.
The Spark strategy uses the correlation between different points in Glaucomatous visual fields to considerably expedite the examination
Glaucoma Staging System (GSS 2)
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.
Display of the GSS2 assessment
Glaucoma Staging Program (GSP)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
Perimeters. This upgrade is available for the existing units.
GSP analysis of a pre-perimetric examination finding
Threshold Noiseless Trend (TNT) Progression Analysis
provides a quantitative, statistical analysis of the visual field examinations conducted overtime. 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.
||Pre-defined glaucoma, macula, screening and neurological tests
||30-2, 24-2, 30x24, 10-2, hemisphere, customized patterns
||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)
||Adaptive, fast, normal, slow, user-defined
||CMOS camera, through central threshold, Heijl-Krakau (using the blind spot)
||Glaucoma Staging System (GSS2), Glaucoma Staging Program (GSP)
||Threshold Noiseless Trend (TNT) progression report
|Perimeter bowl radius:
||r = 30 cm (11.8 in)
|Stimulus luminance range / increments:
||0.03 – 3,180 cd/m² (0.1 – 10,000 asb) / 0.1 log steps
||10 cd/m² (31.4 asb)
||200ms / user-defined
||Measurement head with adjustable angle of inclination,
adaptable double chinrest, double headrest
||Device control, patient management, backup, and print software (Windows®)
Built-in networking, easy EMR-integration, DICOM compatibility
Oculus Easyfield Brochure Incl. Chinrest
|Dimensions (W x D x H)
||316 x 506 x 435 mm (12.4 x 19.9 x 17.1 in)
|Weight with accessories
||6.8 kg (15.0 lbs)
|Max. power consumption
|100/240 V AC
|Min. computer requirements
||Operating system: Windows® XP