The Right Tool for All
The OCULUS 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.
![OCULUS Twinfield® 2](https://www.oculus.de/en/wp-content/uploads/sites/12/2021/10/twinfield_2.jpg)
Functions
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.
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.
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.
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.
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 Test Point Grid
Optimally selected examination areas significantly contribute to meaningful visual field findings. The Twinfield® 2 perimeter provides comprehensive, pre-defined test point grids, which cover all areas ranging from the macula area to the entire field of vision.
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.
Definitely my all-round favourite!
For glaucoma care, macular examinations and neurological cases as well as for formulation of expert opinions, the OCULUS Twinfield® 2 offers me optimal examination methods and meets all my specific needs. The great versatility of Twinfield® 2 coupled with its robustness and reliability has provided a valuable addition to my practice.
Reliable Measuring Methods
Up to the challenge
Static automated perimetry
- Pre-defined programs allow for time-saving, easy-to perform examinations during daily clinical practice.
- A comprehensive set of orthogonal, physiological and freely customizable test grids in combination with suitable testing strategies offer a high degree of flexibility for your examinations.
- Re-examinations of clinically significant areas performed independent of the test pattern in use increase reliability of findings.
![OCULUS Twinfield® 2 - Greyscale representation of findings](https://www.oculus.de/en/wp-content/uploads/sites/12/2024/07/findings.jpg)
![OCULUS Twinfield® 2 - Isopter representation of a kinetic examination](https://www.oculus.de/en/wp-content/uploads/sites/12/2024/07/kinetic_examination.jpg)
Kinetic perimetry
- Strict fulfilment of the Goldmann standard along with free manual positioning and movement of the stimulus allows for truly manual kinetic examinations such as are required for formulating legal expert opinions.
- For semi-automated kinetic tests the starting position and direction of the stimulus are set manually. Movement of the stimulus at a constant speed is computer-controlled and thus examiner-independent. This increases reproducibility of findings.
- Fully automated kinetic tests make it possible to perform rapid tests of the periphery which can be combined with static tests for fast screening of the entire visual field
Focus on Glaucoma
Measurement – Assessment – Progression
The first step: screening for glaucoma
Speed, precision and reliability: the SPARK threshold strategy
Beyond field indices: Glaucoma Staging Program (GSP)
Efficient progression analysis: Threshold Noiseless Trend (TNT)
- 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 an optional addition to the Twinfield® 2. It is fine-tuned for use in clinical examinations of glaucoma patients. Modified versions of the above procedures, called SPARK-N, are available for suspected cases of neurological pathology.
GSP classification is optimized to reproduce expert opinions on glaucoma. The GSP database includes correlations with the entire clinical picture (including structural changes). This information enables GSP to evaluate the degree of risk for the presence of different glaucoma stages on the basis of visual field findings.
Intuitive green-yellow-red colour coding helps in fast and reliable interpretation of the findings. The striking novelty of GSP consists in its capability to identify both glaucoma suspect patients and patients with possible pre-perimetric glaucoma using nothing but measured threshold values.
- 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 and focal progression based on the value of the “Focality Index” (FI).
- TNT uses multiple statistical criteria in establishing progression.
- TNT presents age-related predictions on the visual field.
Title
Description
1) M. González de la Rosa, J Glaucoma 2013
2) D. Wroblewski et al, Graefes Arch Clin Exp Ophthalmol 2009
3) M. González de la Rosa and M. González-Hernandez, Br. J. Ophthalmol. 2011; V.T Diaz-Aleman et al., Br. J. Ophthalmol. 2009
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Technical Data
Static Perimetry
Programs: | Pre-defined glaucoma, macula, neurological and screening tests; Static-kinetic screening; user-defined tests |
Strategies: | Threshold strategies: OCULUS Fast Threshold, Full Threshold, CLIP Optional: SPARK strategy Age-adapted supra-threshold screening (2-zone, 3-zone, quantify defect, OCULUS Class strategy) |
Test patterns: | Rectangular patterns (30-2, 30-2 bs, 24-2, 24-2 bs, 10-2), Physiological patterns (Area 1-8), Quick Screening, Esterman, customized patterns |
Stimulus sizes:/td> | Goldmann I, III, V |
Stimulus colour: | White / Blue / Red |
Stimulus luminance range / steps: | 0 – 318 cd/m² (0 – 1 000 asb) / 0.1 log units |
Background luminance: | 10 cd/m² (31.4 asb) |
Background colour: | White / Yellow |
Stimulus duration: | 200 ms / User-defined |
Examination speed: | Adaptive / Slow / Normal / Fast / User-defined |
Maximum eccentricity: | 90° (full field) |
Fixation control: | Video camera image, through central threshold, Heijl-Krakau (using the blind spot) |
Patient positioning: | Motorised double chinrest, height- and depth-adjustable headrest, ergonomic armrest |
Reports: | Glaucoma Staging Program (GSP) Threshold Noiseless Trend (TNT) progression report |
Kinetic Perimetry
Strategies: | Automatic isopters measured along meridians with freely selectable density Manual: stimulus freely movable with the computer mouse Semi-automatic: including scotoma boundary mapping |
Stimulus speed: | 2°/s (Goldmann), user-defined |
Features
Bowl radius: | r = 30 cm (11.8 in) |
Dimensions (W x D x H): | 790 x 723 x 850 mm (31.1 x 28.5 x 33.5 in) |
Weight: | 40.0 kg (88.1 lbs) – without table |
Max. power consumption: | 65 W – without table |
Voltage: | 90 – 264 V AC |
Frequency: | 50 – 60 Hz |
Recommended computer specifications: | Intel® Core i5, 3,4 GHz, 500 GB HD, Windows® 8 |
Interface: | USB |
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