VIsuScience Front Projection Perimeter

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Standard Full Field White on White Perimetry

The IFA series offer a wide range of test patterns and strategies, including T30-2, T24-2, T10-2 for glaucoma diagnosis and T-Macula for macula function assessment. In addition, special test patterns like driver feasibility, monocular/binocular social security disability are also included. For better detection of visual field loss caused by early stage glaucoma, points of T30-2 and T24-2 are cautiously configured on the most sensitive position of retinal nerve fiber bundle.

 

Precise Diagnosis

Strictly conforming to the newest perimetry standard of IMAGING and PERIMETRY SOCIETY, IFA series simultaneously fulfill the needs for ophthalmological and neurological uses. Equipped with world-wide accepted 31.5 asb background illumination and incorporated with efficient HISA algorithm, comprehensive fixation control and age-related normal database, IFA’s test result is highly consistent with Goldmann standard perimeter.

Its aspheric dome effectively shrinks its size, while ensuring the full field test range.

 

Low Light-declining LED

No Need for Replacement & Calibration

LED light source has characteristics of high efficiency, low heat, long life and low light decay. Its radiating energy reduction is less than 20% after 30,000 hours of illumination. That means, if there is about 300 stimulus for each test, and each stimuli lasts for 200 ms, then, after 1.8 million tests, the stimulus intensity of IFA has attenuated less than 1 dB. Furthermore, to ensure even more stable performance, IFA has built a light measuring sensor internally to detect any abnormal change in light intensity.

 

Gaze Tracking

Minimize effects of unreliable response

“Gaze Tracking” constantly monitors the pupil position and patient’s fixation.

System beeps to draw patient’s attention when a fixation shift is detected. If fixation shift lasts for a while, system will stop test and inquire operator’s intervention.

 

Blink Control

Never miss a stimuli

IFA’s BLINK CONTROL helps patients avoid from dry eyes and relax them to stay focused in subsequent test. When IFA’s BLINK CONTROL is on, stimuli during patient’s blink will not be counted and will automatically be repeated in later test.

 

HISA-Heuristic Interactive Threshold Searching Algorithm

HISA forecasts initial threshold for new point through a complex mathematical model, which takes neighboring tested results and same age normal values into consideration. Then unnecessary search will consequently be avoided.  

HISA does a sample survey from some specific location. Subsequently, time will be saved for patients with serious reduction of sensitivity by skipping those high-sensitivity questions.

 

Kinetic Perimetry

Kinetic Perimetry is supported by IFA-960 as well. During kinetic test, light spot with different intensity slowly moves from periphery to the center. Patient makes response after seeing the light spot. The response position represents the border of visual field on this direction. By connecting all response points, the range of patient’s visual field is depicted. The range of visual field varies by the intensity and size of light spot.

 

Glaucoma Progression Analysis

IFA can accurately differentiate clinically significant progression of visual field loss from random variability within a series of follow up tests, providing an advanced, reliable method to enhance the management of glaucoma. It really helps identify rapidly progressing, high-risk patients.

 

Automated Pupil Measurement

IFA can automatically measure patient’s pupil diameter and print it in report. This benefits comprehension of the correlation between pupil size and perimetry result to avoid wrong report interpretation with too small pupil size.