OCULUS Centerfield® 2

Thanks to its ergonomic design, user-friendly program navigation and ease of operation, the OCULUS Centerfield^® 2 Perimeter has proven itself to be an invaluable instrument in the Occupational Health area. The unit performs static perimetry up to 70° eccentricity. It also meets the requirements of the German Ophthalmological Society’s (DOG) Road Traffic Commission for conducting visual field testing in accordance with the regulations for the issuance of driver’s licenses and the Guidelines G25 and G41 issued by the German Institute for Occupational Health and Safety.

Ergonomic Design

The self-contained design and light-shielded viewer allow examinations to be conducted in normally lit rooms. Its robustness and light weight make the OCULUS Centerfield^® 2 Perimeter the ideal unit for portable use, which is often a necessity in the Occupational Health area.

Reliable Results

The results of the perimetric measurements are summarized in a clearly structured printout. Areas of abnormality can be quickly recognized and re-examination of these areas independent of the test point grid gives the diagnostic analysis even greater reliability.

Modern Connectivity

The OCULUS Centerfield^® 2 Perimeter can be operated via the USB port of a notebook or PC. Together with the supplied device software, this modern solution allows you to fully utilize all of the benefits of today’s IT systems, especially the network connectivity. This guarantees both safe storage of examination data and quick access to that data when needed.

Product Details
Technical Data
Software

The Examination Programs

The recommended series of pre-defined test programs provided for OCULUS Centerfield^® 2 Perimeter covers the examinations most frequently needed in practice. The “Driver’s License Regulations“ program permits occupational and company physicians to test the field of vision in accordance with applicable German regulations (FEV and amendments thereto) governing the issuance of driver’s licenses. The macula and glaucoma programs allow early detection of various retinal diseases.

The OCULUS Test Strategies

Threshold related – suprathreshold strategies have proven to be time-saving and efficient examination methods. The OCULUS Centerfield^® 2 Perimeter uses these strategies for all screening programs, including the Driver’s License eye exams. A variety of threshold testing strategies are available for the measurement of the exact numeric values of the visual thresholds.

The OCULUS Test Point Grid

The patented projection method allows you to freely select test point grids on the OCULUS Centerfield^® 2. The central field of vision can be examined using functionally or orthogonally distributed test points. Grids such as the “FeV70” or “Esterman” are used for the periphery. This unlimited flexibility enables test grids to be modified if necessary.

Technical Data

Features
Programs:	Pre-defined glaucoma, macula, neurological and screening tests; user-defined tests
Strategies:	Threshold strategies: OCULUS Fast Threshold, Full Threshold (4-2), CLIP Optional: SPARK strategy Age-adapted supra-threshold screening (2-zone, 3-zone, quantify defects)
Test patterns:	Orthogonal patterns (30-2, 24-2, 30 x 24, 10-2) Physiological patterns (Area 1-8), Esterman, Profile, customised patterns
Stimulus size:	Goldmann III
Stimulus color:	White / Blue
Stimulus duration:	200 ms / User-defined
Examination speed:	Adaptive / Slow / Normal / Fast / User-defined
Stimulus luminance range:	0-318 cd/m² (0-1000 asb)
Background luminance:	10 cd/m² (31.4 asb)
Background colors:	White / Yellow
Maximum eccentricity:	36° / 70° (with fixation shift)
Fixation control:	CMOS camera, through central threshold, Heijl-Krakau (over blind spot)
Reports:	Glaucoma Staging Program (GSP), Progression report for Threshold Noiseless Trend (TNT)
Kinetic Perimetry:	Strategies: Automated tests along meridians with freely selectable density up to 35° Stimulus speed: 2°/ s (Goldmann-Standard) or user-defined

Features
Bowl radius:	r = 30 cm (11.8 in)
Patient positioning:	Depth-adjustable headrest, optional motorised chinrest
Weight:	12 kg (25.8 lbs); chinrest: 1 kg (2.4 lbs)
Operating voltage:	100 V – 240 V
Operating system:	Windows® XP or above
Interface:	USB
Included in delivery:	Cover, Lens holder for trial lenses, Opaque occluder, Four trial lenses: ± 1.0 sph. and ± 3.0 sph.

In acc. with the Medical Device Directive 93/42/EEC

OCULUS is certified in acc. with DIN EN ISO 13485

Software

Our Latest Software Upgrades

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 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.

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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 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 examinations conducted over time. 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, 30×24 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.