Visual Field Analyzers

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A machine, tool or instrument designed with advanced technology and functionality to perform highly specific tasks with greater precision, efficiency and reliability.

What is Visual Field Analyzers

Visual field analyzers are often used in detection and diagnosis of Glaucoma, AMD, Scotomas and brain abnormalities. These analyzers test the full horizontal and vertical field of peripheral vision, identifying potential diminished or blind spots (scotomas) in the patients’ vision. Identifying specific scotomas in ones vision can be indicative of a certain type of brain trauma or disease, such as a stroke or tumor. The patient is directed to identify certain light stimuli provided by the analyzer in their peripheral vision, if the patient is unable to detect the stimuli, then this could indicate trauma and/or scotomas.

Benefits of Visual Field Analyzers

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Diagnosis and Staging
A Visual Field Analyzers is performed at the initial visit or as soon as glaucoma is suspected. It evaluates vision loss due to glaucoma, damage to the visual pathways of the brain, and other optic nerve diseases. When glaucoma is diagnosed the visual field data is used to determine the severity of disease. This staging information is useful in choosing a target intraocular pressure and determining follow-up.

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Following for Progression
After the initial diagnosis the doctor will repeat the Visual Field Analyzerst to check for worsening disease. This may be done in three to twelve months depending on the severity. If there are worsening defects or new areas of damage, a lower intraocular pressure and change in therapy may be needed. Many studies have shown that visual fields are variable over time and there is a learning curve when taking the test, so your doctor may ask you to repeat the test to confirm your results.

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Abundant inspection modes for both accuracy and speed
Rich threshold inspection and suprathreshold inspection modes to detect early visual field defects.The scientific and intelligent interactive inspection strategy improves work efficiency. It only takes 3 minutes to inspect the 30° field of view.

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Comprehensive Analysis Software
6 kinds of analysis: Reliability analysis, single-report analysis, multi-report analysis, glaucoma half-field analysis, glaucoma progression analysis, VFI visual field index analysis.Half-field analysis designed for glaucoma makes glaucoma diagnosis easier.Analysis of glaucoma progression, where very subtle progression is more visible and continues to suggest new progression.

Types of Visual Field Analyzers

Automated Visual Field Analyzer

The BIO-1000 automated visual field analyzer is a static perimeter designed to provide accurate and speedy diagnosis and monitoring of visual nerve diseases and glaucoma. Based on the International Goldmann standard design, the product is developed to offer crucial inspection modes for patients and provide them with optimal visual care.

Projection Perimeter

Auto self-checking when powered on, real-time display of self-checking procedure, detailed checking list presented. Easily obtain the current status of the projection perimeter.

Auto Projection Perimeter

BIO-1100 auto Projection Perimeter is an advanced diagnostic tool that is mainly used to detect visual field defects in patients. It executes the Goldmann international standard for visual field measurement and provides the most comprehensive inspection modes.

Application of Visual Field Analyzers

Screening for glaucoma: Peripheral vision loss is often an early and subtle sign of glaucoma. Visual field tests help detect vision loss and make the diagnosis of glaucoma, and repeat testing is used to monitor treatment.

Screening and testing for lid droop (ptosis)

Testing for toxicity from certain medications (for example, screening for toxicity from hydroxychloroquine [Plaquenil], which can affect the central retina)

Measuring the extent of retinal diseases, such as retinitis pigmentosa

Detecting conditions affecting the optic nerve, such as tumors, injury, poor circulation or stroke, optic neuropathy, swelling of the optic nerve (optic neuritis), compression from swelling in the eye socket or orbit, and severe nutrient deficiencies

Detecting conditions that affect the visual pathways from the optic nerves to the occipital lobe of the brain, including tumors, inflammatory disease, increased intracranial pressure, injury, poor circulation, or stroke

Testing for malingering behavior or factitious disorders

Components of Visual Field Analyzers

Display screen
Used to display patterns, light spots or other visual stimuli during the test. The patient needs to look at the display screen to complete the test.

Concave mirror or spherical mirror
Used to adjust the size, brightness and position of the pattern or light spot on the display screen to ensure that the patient's visual field can be accurately stimulated during the test.

Eye positioning system
Used to ensure that the patient's eyes remain in a stable position during the test, usually including components such as headrest and chin rest.

Eye tracking system
Some advanced visual field analyzers are also equipped with eye tracking systems, which can monitor the movement trajectory of the patient's eyeballs in real time to help analyze the relationship between eye movement and visual field range.

Computer system
Used to control the operation of the visual field analyzer, display test results, store data, and perform data analysis and report generation.

Test program
The visual field analyzer is usually equipped with a variety of test programs, such as static visual field test, dynamic visual field test, strabismus test, etc. Doctors can choose the appropriate test program for visual field analysis according to their needs.

Data processing software
Used to process and analyze test result data, generate visual field maps, statistical charts, etc., to help doctors diagnose and monitor diseases.

Calibration system
The visual field analyzer needs to be calibrated regularly to ensure the accuracy and reliability of the test results.

How to Choose Visual Field Analyzers

Test Menu and Analytical Capabilities

Assess the analyzer's test menu and analytical capabilities to ensure that it can perform the necessary tests required for your laboratory's diagnostic needs. Look for analyzers that offer a comprehensive range of tests and parameters relevant to your specialty or focus area.

Accuracy and Precision

Accuracy and precision are paramount in blood chemistry analysis. Evaluate the analyzer's performance specifications, including coefficients of variation (CV), linearity, and calibration stability, to ensure reliable and reproducible results.

Ease of Use and Workflow Integration

Choose an analyzer that is user-friendly and seamlessly integrates into your laboratory's workflow. Consider factors such as instrument interface, software functionality, sample handling automation, and compatibility with laboratory information systems (LIS).

Maintenance and Service Requirements

Assess the analyzer's maintenance and service requirements, including calibration procedures, instrument downtime for preventive maintenance, availability of technical support, and service contract options.

Cost and Budget Considerations

Evaluate the total cost of ownership, including initial purchase price, reagent costs, maintenance expenses, and ongoing operational costs. Choose an analyzer that aligns with your budget constraints while meeting your performance and functionality requirements.

Regulatory Compliance and Accreditation

Ensure that the analyzer complies with regulatory standards and accreditation requirements applicable to your laboratory setting, such as Clinical Laboratory Improvement Amendments (CLIA) regulations and accreditation by organizations like the College of American Pathologists (CAP) or the International Organization for Standardization (ISO).

How to Use Visual Field Analyzer?

Setting up the Visual Field Analyzer

To set up the Visual Field Analyzer, begin by ensuring the Field Analyzer HFA II-i Series equipment is properly connected to the network using a network cable.Calibration is vital to guarantee accurate results. Regular maintenance of the equipment ensures optimal performance. Stay vigilant for software updates to maximize functionality.Data security is paramount, so configure the system to export reports securely. When setting up, configure the system to export visual field reports in .tiff format and establish shared folder access.Ensure proper network connectivity by entering the workgroup or domain name. Save settings diligently after each setup step to avoid data loss and maintain system integrity.

Conducting a Visual Field Test

When conducting a visual field test using the Visual Field Analyzer, ensure proper patient positioning and calibration of the equipment for accurate and reliable results. To conduct the test effectively, consider the following:Patient positioning: Ensure the patient is comfortable and correctly positioned to maintain steady fixation.

Interpreting the Test Results

When interpreting the test results of a visual field examination, focus on analyzing the item difficulty, discrimination, reliability coefficient, and distractor evaluation for comprehensive evaluation. Understanding implications of these factors is crucial in identifying abnormalities.Analyzing patterns in the results allows for comparing data across different sections of the visual field. Evaluating reliability through the reliability coefficient helps ensure the consistency of the test outcomes.

How to Maintain Visual Field Analyzers

Cleaning

Regular cleaning of Visual Field Analyzers ensures that it is ready for use when needed, that stubborn stains/substances do not get a firm hold, and that experiments are not contaminated by impurities carried over from previous experiments.The equipment is always cleaned before and after each use.Cleaning reagents and cleaning aids used are specific for laboratory equipment care.In addition to cleaning Visual Field Analyzers before and after each use, a schedule is required for more in-depth cleaning. This might involve dissembling certain machines to clean hard-to-reach parts.Always follow instructions from the manufacturer on cleaning policy.Certain parts of the equipment might require very specific solvents, cleaning materials, or drying procedures.

Calibration

Calibration involves comparing the measurements of equipment against the standard unit of measure, for the purpose of verifying its accuracy and making necessary adjustments. Regular calibration of laboratory equipment should be done because over time, biases develop in relation to the standard unit of measure.This guards against invalid data and ensures safety during experimentation. An independent specialist, that can provide calibration certificates where necessary, should be engaged in the process.The recommended time by the manufacturer elapses.The equipment is hit by a force, dropped on the ground, or involved in an accident or event of safety concern.There are unusual patterns or sounds while the equipment is in use.Measurements obtained are questionable.Highly critical measurements, where data accuracy is of utmost importance, are to be carried out.

Repairs and Refurbishments

Visual Field Analyzers is generally costly and repairs and refurbishment prolong the lifespan of equipment, saving the lab the expense of new purchases.Repair and/or refurbish faulty or worn-out Visual Field Analyzers without any delay. Faulty machines may stop working suddenly in the middle of an experiment leading to losses and they can also be a source of safety concerns.Minor repairs can be done by a dedicated staff, while major repairs should be directed to specialists with knowledge of the specific machine or equipment.Refurbish old equipment to give them a new lease of life by cleaning thoroughly, polishing where necessary, lubricating movable parts, and replacing small worn out bits.

Quality Replacement

Equipment that cannot be repaired or refurbished should be replaced. It is advisable to buy equipment from well-known sources that can guarantee quality and offer technical support.High-quality Visual Field Analyzers is easier to maintain and its durability translates to reduced costs in the long term.Non-faulty equipment that is too old should also be replaced, while some wear and tear might not be noticeable during its operation, outdated machines are not reliable and technical support in terms of servicing and acquisition of spare parts may be limited.

Global Automated Visual Field Analyzer Market Analysis

Rapid Technological Advancement And Developments In The Analyzer Technology

In the modern era, there is a number of advancements that are being introduced in automated field analyzers. New software algorithms have been introduced, which is one of these significant advancements in the complex technology of this equipment. A surge in the frequency of product launches is one of the main factors projected to fuel the market's expansion. Recent developments in the technology are leading to the development of various novel visual function tests.

Offers Reduced Turnaround Time To Doctors And Patients

The turnaround time for automated visual field analyzers has greatly decreased, and accuracy in visual field testing has increased in contrast to recent years. Due to a number of efforts and initiatives being taken by several market players operating in the automated visual field analyzer market, the turnaround time of these analyzers has been reduced significantly. With the lesser turnaround time, doctors at several clinics are now able to accelerate the pace of diagnosis and treatment of their patients.

Lack Of Precision And Versatility Of Analyzers

Despite a number of benefits of an automated visual field analyzer, there is a major drawback of this technology. Automated visual field analyzers are highly prone to making errors due to a number of factors. For example, the result of a test conducted with the automated field tester can be very easily hampered by incorrect placement of the head. Even a slight movement in the position of the patient's head can completely influence the result. Moreover, patients with severe glaucoma are very hard to be diagnosed accurately.

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VisualTech (Shanghai) Corporation, commonly referred to as VisualTech, is a professional supplier of ophthalmic equipment, optometry and ophthalmic medical instruments, as well as optical lab equipment for the eyeglasses. The company is located in the bustling metropolis of Shanghai, China.VisualTech is committed to innovative self-development, constantly striving to lead the industry while adhering to the highest standards of quality. The company provides customers with high-quality, innovative and trustworthy services.

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FAQ

Q: What is a visual field analyzer used for?

A: A visual field test measures your peripheral vision, or how well you can see above, below and to the sides of something you're looking at. It's also called a perimetry test. Visual field testing is important for many conditions, including glaucoma.

Q: What is a vision analyzer?

A: Visual field analyzers are often used in detection and diagnosis of Glaucoma, AMD, Scotomas and brain abnormalities. These analyzers test the full horizontal and vertical field of peripheral vision, identifying potential diminished or blind spots (scotomas) in the patients' vision.

Q: How do you Analyse a visual field?

A: The examiner moves an illuminated white target from the periphery towards the centre, and the patient presses a buzzer to indicate when they first see the target. This is repeated from different directions—allowing the examiner to plot the patient's field of vision—using targets varying in size and brightness.

Q: What is a visual analyzer of the eye?

A: The visual analyzer, commonly known as the visual system or vision system, is the sensory system that allows organisms to process visual detail as well as several non-image forming visual functions. The physiological components involved in vision include the eyes, neural pathways, and visual cortex.

Q: What does a visual field test tell you?

A: Visual field tests help your doctor figure out whether you have blind spots, where they are, and what their shape is. This can tell you a lot about how an eye disease or brain disorder affects you. Visual field tests can also diagnose issues with your eyelids.

Q: What does it mean if you fail a visual field test?

A: If your visual field test is not normal, you may need additional follow-up testing, as well as treatment. A visual field test can help diagnose scotomas , or blind spots. It can also help identify loss of peripheral or side vision. Loss of side vision is an indicator of glaucoma, a disease that can lead to blindness.

Q: What does 30 2 visual field mean?

A: This gives a round printout with 30 degrees around the fovea (the radius of the field is 30 degrees). The digit 2 in this test denotes that the points are not located exactly on the vertical or horizontal midline (points are located at the midline in the 30-1 test in the HFA-1 machine).

Q: What does 24-2 mean in visual field?

A: Beneath the patient's name is a statement giving information about the testing parameters, such as "Central 24-2 Threshold Test." The first statement, "Central 24" indicates that the central 24 degrees of visual field were analyzed. The next number indicates how the grid of points is aligned to the visual axis.

Q: How do I read my visual field test results?

A: In a typical exam, the instrument will throw the light into the blind spot maybe 17 to 20 times, and then you can count how many times the patient saw the light. So, if they say they saw the light four out of 19 times, that means the patient wasn't looking straight ahead more than 20 percent of the time.

Q: Can a visual field test detect a brain tumor?

A: Yes, eye tests can sometimes detect brain tumours. In fact, they can even spot brain tumours before there are any noticeable symptoms, making routine eye tests a good choice if possible.

Q: Can I drive after a visual field test?

A: During this test we use eye-drops to dilate (open) the pupil – the drops can cause blurring of vision for a few hours, and it can take up to 24 hours for the effects of the drops to wear off. Therefore we advise that you do not drive yourself home from the eye clinic.

Q: Do they dilate your eyes for a visual field test?

A: During this test, your eye doctor will insert eye drops to both dilate and numb your eyes. Your eyes will be held open with a speculum, while a tiny electrode is placed on your cornea. While you look at the flashing lights in the perimeter machine, the electrode will measure your eye's response to each light.

Q: What does it mean if you have visual field defects?

A: The nerves that carry visual signals follow a complex pathway from the back of the eye to the brain's visual processing center, called the occipital lobe. When any part of this pathway is damaged because of a disease or an injury, part of the visual field may disappear. This is called a visual field defect.

Q: Who needs a visual field test?

A: Visual field testing is an important part of regular eye care for people who are at risk for vision loss from disease and other problems. People with the following conditions should be monitored regularly by their ophthalmologist, who will determine how often visual field testing is needed: Glaucoma. Multiple sclerosis.

Q: How accurate is the field vision test?

A: The specificity of confrontation testing was high at 93.4%. The high positive predictive value (72.6%) and negative predictive value (75.7%) would indicate that visual field defects identified during confrontation testing are often true visual field defects.

Q: What causes poor visual field?

A: Causes of visual field defects are numerous and include glaucoma, vascular disease, tumours, retinal disease, hereditary disease, optic neuritis and other inflammatory processes, nutritional deficiencies, toxins, and drugs. Certain patterns of visual field loss help to establish a possible underlying cause.

Q: What does an analyzer do?

A: An analyser (British English) or analyzer (American English; see spelling differences) is a tool used to analyze data. For example, a gas analyzer tool is used to analyze gases. It examines the given data and tries to find patterns and relationships. An analyser can be a piece of hardware or software.

Q: What is the use of visual analysis?

A: Visual analysis identifies and explores characteristics of example material and relationships within the context in which they were produced and encountered. The purpose of visual analysis is to make an argument based on visual evidence.

Q: Where is visual analytics used?

A: Business users can leverage visual analytics to more easily explore and understand large volumes of diverse data and gather the insights they need to solve problems, identify key opportunities, optimize performance, and inform strategic and tactical decision-making.

Q: What is normal range for field of vision?

A: A normal visual field is an island of vision measuring 90 degrees temporally to central Fixation, 50 degrees superiorly and nasally, and 60 degrees inferiorly. Visual acuity increases from movement discrimination in the extreme peripheral vision to better than 20/20 in the center of vision.Visual field testing can help your eye care provider find early signs of diseases like glaucoma that gradually damage vision. Some people with glaucoma don't notice any problems with their vision, but the visual field test shows a loss of peripheral vision.

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