Vertical prism disparity in aircraft windshields

Area of Science:

• Optics and Vision Science
• Aerospace Engineering
• Human Factors Research

Background:

• Optical distortion in aircraft windshields can impact pilot vision.
• Current quantification methods include displacement grading.
• Potential links between optical distortion and binocular stress are hypothesized.

Purpose of the Study:

• To evaluate the relationship between displacement grading and vertical prism disparity in F/FB-111 aircraft windshields.
• To test the hypothesis that displacement grading magnitudes correlate with vertical prism disparity.
• To inform binocular design specifications for military aircraft windshields.

Main Methods:

• Three F/FB-111 windshields with varying displacement grading values were selected.
• Vertical prism disparity was measured for each windshield.
• Displacement grading technique was employed for quantification.

Main Results:

• A direct correlation was found between displacement grading magnitudes and vertical prism disparity.
• The experimental results supported the initial hypothesis.
• Higher displacement grading values corresponded to greater vertical prism disparity.

Conclusions:

• Varying displacement grading in F/FB-111 windshields directly influences vertical prism disparity.
• Establishing a maximum vertical prism disparity value is crucial for binocular design specifications in military aircraft.
• This research supports the need for stricter optical quality standards in aviation windshields.