Understanding and Managing Mask Visual Field Tester GT-RA07
The Mask Visual Field Tester GT-RA07 is a precision instrument designed to evaluate the effective field of vision in full-face masks, half-face masks, and other respirators. Ensuring the visual field under a mask meets standard requirements is essential for user safety and comfort, particularly in industries where respiratory protection is critical, such as healthcare, manufacturing, and emergency response.
The Mask Visual Field Tester GT-RA07 utilizes an apertometer to trace and measure the visual field. The primary objective is to determine whether a mask allows an adequate visual range without significant obstructions, ensuring users maintain awareness of their surroundings while wearing protective gear.
Testing Process:
- The mask is fitted onto a dummy head with lighting in each eye socket.
- The apertometer traces the shadow curves projected onto a hemispherical surface.
- Measurements include both the total field of vision and the overlapping field of vision, ensuring compliance with regulatory standards.
Acceptance Criteria
Before initiating the test, follow these preparation steps to ensure accurate results:
1. Install the Test Head Mould:
Attach the head mould and connect all necessary wires securely.
2. Head Mould Positioning:
- Adjust the head mould to the center position (0°), facing forward.
- Lock it in place to prevent any movement during testing.
3. Machine Level Adjustment:
Use the spirit level to ensure the machine is perfectly aligned.
4. Power Supply Check
- Confirm that the power source is stable and connected properly.
- Verify that both left and right lamp beads are glowing correctly.
Operational Steps
Testing with the Mask Visual Field Tester GT-RA07 involves evaluating both eyes separately and then analyzing the overlapping field of vision. Follow these steps for accurate operation:
1. Mask Installation
Fit the mask securely onto the dummy head. Ensure there is no slack or misalignment.
2. Left Eye Test
- Adjust the Head Mould: Move it to the right to position the left eye for testing.
- Activate the Left Lamp: Switch on the lamp and observe the visual field sphere.
- Plot the Curve: Trace the shadow formed on the sphere and draw the corresponding curve.
3. Right Eye Test
- Adjust the Head Mould: Move it to the left to position the right eye for testing.
- Activate the Right Lamp: Switch on the lamp and observe the visual field sphere.
- Plot the Curve: Trace the shadow formed on the sphere and draw the corresponding curve.
4. Overlapping Field Analysis
- Curve Intersection: Observe where the left and right eye curves intersect.
- Degree of Blocked Vision: Analyze the intersection to determine how much of the field of vision is obstructed by the mask.
Why Visual Field Testing Matters
Effective visual field testing ensures that respirators and masks provide:
- Safety: Users can remain aware of their environment, reducing accidents.
- Comfort: Minimizing visual obstructions enhances long-term wearability.
- Compliance: Adherence to industry standards and regulations is essential for product approval and user trust.
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Common Industries Utilizing the mask visual field testing machine
1. Healthcare: Surgical and protective masks require unobstructed vision for precision tasks.
2. Manufacturing: Workers need clear peripheral vision to avoid accidents.
3. Emergency Response: First responders rely on masks that provide both protection and situational awareness.