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Oculus Easyfield

Easyfield-oculus
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The Easyfield® C is designed for use as a visual field screener and a threshold perimeter for immediate re-examination of any abnormal findings. Full compliance with Goldman Standards makes the Easyfield® C ideal for all common examinations of the central field of vision up to 30°. The Easyfield® C has an adjustable double chin rest and eye shields for maximum patient comfort.

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Features

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).

 

Advantages

 

  • Fast: Shorter examination times even for threshold tests
  • Compact: No completely dark room required thanks to the closed construction
  • Lightweight: Minimal footprint and maximal transportability
  • Robust: Easy to service in the absence of moving parts
  • More than screening: Supra-threshold and threshold tests
  • Comprehensive perimetry: Advanced test strategies, unique evaluation tools, efficient progression analysis.

Hardware Facelift

 

  • The redesigned double headrest 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 double chinrest (Easyfield® C only) improves the quality of examinations by sensibly increasing the comfort of the patients.
  • The stylish design of the chinrest is adapted to the ergonomically movable perimeter cone for complete versatility. Building on a proven design Ergonomic and patient-friendly
  • The high resolution camera for better video control image of the patient’s eye improves the reliability of exams.
  • A spring-loaded double mount offers increased stability for the correction lens holder.
  • Standard USB interface offers connectivity of the OCULUS Easyfield® with any external Windows computer, hence network integration is straightforward.
 

Standard Automated Perimetry

Screening

Screening with the OCULUS Easyfi eld® is most commonly carried out by performing supra-threshold examinations of the central visual fi eld. 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 fi eld is obtained, without numerical dB values, but with the identifi cation of peculiar locations.
The Easyfi eld® employs threshold oriented supra-threshold strategies with 2 or 3 zones, recognizing defects or absolute and relative defects, respectively. The predefi ned “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 OCULUS Easyfield® perimeter offers various ways for threshold
measurements:

  • 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.
 
 

Fighting Glaucoma
Measurement – Assessment – Progression

Increased Precision: The new SPARK threshold strategy

The SPARK1) strategy is based on statistical relationships between threshold values corresponding to different ocations in the glaucomatous visual fi eld , derived after analyzing more than 90,000 perimetric examinations.
The large amounts of available statistical data make fast and very precise measurements of the threshold values in the central visual fi eld possible. The ingenious modular structure of the method in four phases allows a diversifi ed use of the SPARK strategy in the clinical practice:
SPARK Precision is the full-fl edged version of SPARK. The complete visual fi eld examination of glaucomapatients is performed in 3 minutes per eye; theaveraged results of the four phases present an outstanding stability and repeatability, making possible an improved progression analysis. The strategy is available as an additional option for Easyfi eld®.

SPARK Quick is the strategy for follow-up or screening examinations. Only 1:30 minutes per eye are necessary.

SPARK Training is ideal for patient training. This 40 seconds measurement can also be used for screening. 
The SPARK strategy is fi ne-tuned for use in clinical examinations of glaucoma patients. In order to be used in suspected neurological pathologies, alternative versions of the above methods, labeled SPARK-N, are available for the OCULUS Easyfi eld®.

 

Advanced assessment: Glaucoma Staging System (GSS 2)
The Glaucoma Staging System2) classifi es the visual field results using the values of the mean defect (MD) and the pattern standard deviation (PSD or CPSD). The representative point of the examination is placed on a diagram according to the values of the perimetric indices. The diagram displays clearly separated regions for different diagnostic stages related to the advance of the disease (Stage 0 – Stage 5); at the same time, generalized, localized and mixed defects are distinctly identifi ed.

Beyond fi eld indices: Glaucoma Staging Program (GSP)
This novel evaluation module performs a thorough assessment of individual visual fi eld fi ndings using modern algorithms of pattern recognition. Besides the unique contribution to early glaucoma diagnosis, GSP1) can substantiate the clinical evaluation of test results.
The GSP classifi cation is optimized to reproduce glaucoma expert opinions. The database of GSP includes correlations with the whole clinical picture (including structural changes); this information enables GSP to evaluate the risks for the presence of different glaucoma stages starting from the visual fi eld fi ndings.
Intuitive Green-Yellow-Red color coding helps in fast and reliable interpretation of the fi ndings. The striking novelty of GSP consists in its capability to identify both glaucoma suspect patients and patients with possible pre-perimetric glaucoma using only the measured threshold values.

 

Effi cient progression analysis: Threshold Noiseless Trend (TNT)
The TNT2) software module objectively evaluates changes over time in visual fi eld results. Combined with the fast SPARK strategy, it increases considerably the sensitivity for detecting progression in early glaucoma.

  • 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 according to the value of the “Focality Index” (FI).
  • TNT uses multiple statistical criteria in establishing progression.
  • TNT presents a prediction about the expected visual fi eld for a chosen patient’s age.
 

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