The OCULUS Smartfield is a compact visual field device purposefully optimized for monitoring functional impairment in glaucoma. Based on an ultra-high-luminance LCD screen it performs standard automated perimetry of the central visual field and beyond. Despite its small size, the Smartfield perimeter offers a comprehensive clinical solution in visual field testing for any glaucoma practice.
Increased Diagnostic Reliability
Powerful test strategies such as SPARK and other assessment tools contribute to the great diagnostic utility of the Smartfield perimeter. The enhanced Glaucoma Staging System (GSS 2) of Dr. Brusini and the Glaucoma Staging Program (GSP) offer extended support in single field analysis. Structure-function relationships are predicted by the new PATH evaluation module. The Threshold Noiseless Trend (TNT) module performs efficient progression analysis. Examination quality is ensured by a patented fixation control algorithm, a high resolution video camera for eye monitoring and the various built-in catch trials.
The Smartfield is equipped with a set of predefined programs for the most frequently needed examination routines of the central visual field or the macular area. A default program for the
periphery is also included. The program list can be easily extended according to specific requirements by combining the available test patterns and test strategies.
OCULUS Test Strategies
The Smartfield features the innovative SPARK test strategy for faster and more stable threshold measurements in glaucoma patients. Rounding off the testing capabilities of the Smartfield is the complete
set of traditional OCULUS test methods, including threshold and suprathreshold strategies. The classical 4-2 dB staircase strategy (Threshold) uses two reversals in the patient’s answer to deliver a threshold value in each tested point. The OCULUS Fast Threshold strategy is a clever improvement over the classical procedure which reduces examination time by using variable steps and taking advantage of already measured locations. Suprathreshold strategies like the 2-zone or 3-zone strategy offer a quick overview of the visual field.
Measurement results of the Smartfield perimeter are commonly summarized in a standard printout. For suprathreshold tests a qualitative overview is printed, whereas for threshold examinations all clinically relevant data are shown in various representations. Besides the standard printout the Smartfield software features various assessment displays.
Predicting Anatomy from Thresholds (PATH)
Functionality of a retinal location obviously depends on the underlying anatomical structure of the retina in that location. One characteristic feature of glaucoma is that there is a close connection between sensitivity levels of given retinal locations (as described by visual field measurements) and anatomical structures related to the optic nerve head. The merit of PATH is that it provides an estimate of the retinal nerve fibre layer (RNFL) thickness around the optic nerve head and the relative area of the neuroretinal rim based solely on the results of visual field measurements performed with the SPARK examination strategy. This novel approach of predicting structure from function is made possible by the high reproducibility of the SPARK visual field exams.
Predicting RNFL thickness
Working from the results of SPARK perimetry, RNFL thickness is predicted at 25 points of the TSNIT (Temporal – Superior – Nasal – Inferior – Temporal) circle around the optic nerve head. The value at each point is calculated from functional data selected for relevance. This selection is based on an objectively automated machine learning algorithm and does not rely on other findings such as on the correspondence between nerve fibre pathways and visual field areas.
Predicting the relative area of the neuroretinal rim
A linear combination of relevant threshold results is used in order to predict the ratio between the neuroretinal rim area and the total area of the optic disc. The result is compared to normative data and expressed as a percentage of the population average value (normalized to 100%).
|Programs||Pre-defined glaucoma, macula, screening and neurological tests
|Test patterns||30×24 (SPARK), 24-2, 10-2, customized patterns|
|Strategies||Threshold strategies: SPARK Precision, SPARK Quick, OCULUS Fast Threshold, Full Threshold (4/2), Age-adapted suprathreshold screening (2-zone, 3-zone)|
|Fixation control||Through central threshold, Heijl-Krakau (using the blind spot), live video image|
|Result display||Greyscale, dB values (absolute/relative), symbols, probabilities, 3D plot|
|Reports||Enhanced Glaucoma Staging System (GSS 2), Glaucoma Staging Program (GSP), PATH function-structure analysis, Threshold Noiseless Trend (TNT) progression report|
|Stimulus viewing distance||Infinity|
|Max. eccentricity horizontal/vertical||30°/25° (60°/50° with fixation shift)|
|Stimulus size||Goldmann III|
|Stimulus duration||200 ms/user-defined|
|Threshold range/step||0.8 – 3 180 cd/m2 (2.5 – 10 000 asb), 0 – 36 dB/1 dB|
|Background luminance||10 cd/m2 (31.4 asb)|
|Patient positioning||Height-adjustable measuring head, adjustable chin rest, double head rest|
|Software||Device control, patient management, backup and print software (Windows®)
Built-in networking, easy EMR-integration, DICOM compatibility
|Dimensions (W x D x H)||332 x 418 to 477 x 402 mm (13.1 x 16.5 to 18.8 x 15.9 in)|
|Weight||7.6 kg (16.8 lbs)|
|Max. power consumption||30 W|
|Voltage||100 – 240 V AC|
|Frequency||50 – 60 Hz|
|Recommended computer specifications||Intel® CoreTM i5, 500 GB HDD, 8 GB RAM, Intel® HD Graphics, Windows® 10|