Easyfield

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. Multiple test strategies are available for determination of the exact numeric values of the perception thresholds.  (We prefer not to promote CLIP anymore.) The OCULUS „Fast Threshold” achieves a similar performance with clever improvements to the classic 4-2 step method. The unique SPARK strategy provides a rapid and reproducible threshold measurement for glaucoma patients.

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.

SPARK Strategy

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 diagnoses and allows a very fast, yet very precise measurement of the thresholds in the central field of vision. The modular configuration of the method makes it suitable for a variety of applications:

• SPARK Precision (optional software) is the full version. The complete examination of the field of vision of glaucoma patients takes only 3 minutes per eye. The greater stability of the results allows for much better progression analysis.
• SPARK Quick is the strategy used for progression or screening examinations. The test takes just 90 seconds per eye.
• SPARK Training is ideal for patient training. The 40 seconds measurement can also be used as a screening examination.

Glaucoma Staging System (GSS 2) per Brusini

The Glaucoma Staging System (GSS 2) per 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 in accordance with the values of these indices. The chart shows defined areas for the different stages of disease (Stage 0 – Stage 5). It also separates generalized, localized and mixed defects.

Glaucoma Staging Program (GSP)

The Glaucoma Staging Program (GSP) is useful in early detection of Glaucoma.

The GSP software grades 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 of different severities that are classified as normal or glaucomatous. The examination results are presented in easy to understand green, yellow and red bar charts.

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

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

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

Threshold Noiseless Trend (TNT) Progression Analysis

TNT provides a quantitative, statistical analysis of the visual field examination results conducted over time. For follow-up purposes, the software uses the visual field results and patient’s threshold values supplied by 30-2, 30×24 or 24-2 grids over the entire examination period. 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 of 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 focusing 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.