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Oculus Twinfield 2

Twinfield-2-oculus
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The Twinfield® 2 provides you with the very best of our more than 50 years of experience in the perimetry area. This device measures the full field of vision using both automatic, static perimetry and automatic or manual kinetic examinations. The Twinfield® 2 received the express recommendation of the German Ophthalmology Society (DOG) for expert assessment perimetry.

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Features

Twinfield® 2

The Twinfield® 2 provides you with the very best of our more than 50 years of experience in the perimetry area. This device measures the full field of vision using both automatic, static perimetry and automatic or manual kinetic examinations. The Twinfield® 2 received the express recommendation of the German Ophthalmology Society (DOG) for expert assessment perimetry.

Static Perimetry

The Twinfield® 2 performs fast and versatile automatic static examinations to measure the central field of vision with a high degree of accuracy. In the macular area, the precision is increased even more by a considerable densification of the test points, and the periphery can be tested using a suitable test grid. The modular setup of the examination programs guarantees that the Twinfield® 2 Perimeter can be adapted to meet all clinical research and daily practice requirements.

 
 

Improved Diagnostic Reliability

Additional processes improve the diagnostic reliability of perimetric examinations conducted with the Twinfield® 2 Perimeter. Re-examination of areas of concern independent of the test point grid and remote observation of the patient’s eye increase the reliability of the findings; the expert system Glaucoma Staging Program (GSP)provides valuable support in the analysis of the findings. 

 

Kinetic Perimetry

Exact adherence to the Goldmann Standard allows the Twinfield® 2 to be used for assessment perimetry purposes. Automation of the kinetic examinations increases the reproducibility of the test. Fast and comprehensive testing of the entire field of vision testing is achieved by linking the fully automatic kinetic tests with static testing methods.

 
   

Function

 

The Examination Programs

The pre-defined test programs of the Twinfield® 2 Perimeter have been set up in such a way that you can easily perform the examinations that you require most often. Whether glaucoma, age-related macular degeneration, neurological diseases – appropriate examinations are available for them all. Furthermore, the modular setup of these programs enable you to create custom test processes, as all available test point grids can be conveniently combined with all OCULUS test strategies. You can thus extend the comprehensive standard program series to meet your own particular requirements.


 
 

The OCULUS Test Strategies

To gain as much information in the shortest possible time – this principle has always been heeded in the development of all OCULUS test strategies.  The SPARK Strategy incorporates data from more than 90,000 diagnoses in a matter of minutes to give precise and stable measurements, especially in Glaucoma detection, diagnosis and progression analysis.  The OCULUS Fast Threshold achieves a similar performance with clever improvements to the classic 4-2 step method.  And since exact numeric values of the perception threshold do not, in many cases, show any priority, the multiple suprathreshold strategies available in the Twinfield® 2 Perimeters offers a faster and more comfortable alternative.

 
 

The OCULUS Test Point Grid

Optimally selected examination areas significantly contribute to meaningful visual field findings. The Twinfield® 2 Perimeter Perimeter provides comprehensive, pre-defined test point grids, which cover all areas ranging from the macula area to the entire field of vision. Grids with a higher density of test points in the center, which take account of the physiology of the retina, are the trademark of the Twinfield® 2. Grids with uniform, orthogonally distributed test points along with other grids, such as the Esterman grid, complete the list of available examination areas.

 
 

Results Printout

The measuring results of the Twinfield® 2 Perimeter are summarized in the standardized results printout. For threshold-determining examinations, all clinically relevant data are recorded and are shown in various different depictions whereas for suprathreshold tests, only a single informational overview is printed.

 
   

Perimetry-Software

 

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 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 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 and Easyfield® C Perimeters.  This upgrade is available for the existing units.

 

GSP analysis of a pre-perimetric examination finding

 Threshold Noiseless Trend (TNT) Progression Analysis

 

TNT Display

   

 Technical Data

 

Programs Glaucoma (screening, localization, threshold) Macula (screening, localization, threshold) Static-Kinetic Screening, Profile, User-Defined Programs
Strategies Threshold strategies: CLIP, Fast threshold, Classic 4/2 threshold strategy Suprathreshold strategies: 2-zone, 2-zone, defect quantification, Oculus class strategy
Examination areas Physiological grid (Area 1-8), orthogonal grid (30-2, 30-2 bs, 24-2, 24-2 bs, 10-2), FeV-70, Estermann, Profile, Customized test point grids

Kinetic Perimetry
Strategies Automatic: Isopters in freely selectable meridians with selectable distances. Stimulus speed 2°/s (Goldmann) or manually selectable: Stimulus freely moveable with the mouse Semi-automatic: Determination of the scotoma outer limits

Features
Bowl radius r = 30 cm (11.8”)
Stimulus size Goldmann I, III, V
Luminance range / - increments 0-318 cd / m2 (1000 asb) / 0.1 log units
Ambient brightness 10 cd / m2 (31.4 asb)
Speed slow / normal / fast / adaptive / user-defined
Stimulus colors white / blue / red
Background colors white / yellow
Maximum eccentricity 90° (full field of vision)
Fixation control CMOS camera, via central threshold or Heijl-Krakau (blind spot)
Patient positioning Motorized chin rest, depth and height-adjustable head rest, ergonomically arranged arm rest
Weight 24 kg (without table and PC components)
Power supply 100 V – 240 V
Minimum computer requirements Windows 2000 or later
Interface USB

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