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                                           UNCLASSIFIED

       03  06           AUG  90  RR  RR  UUUU                   DOSSL/43063

       A.  AIRCREWS MAY EXPECT TO HAVE DIFFICULTIES INTERPRETING HUD AND

       OTHER SIMILARLY LIGHTED DISPLAYS.  THERE ARE TWO MAIN REASONS FOR

       THIS OCCURRENCE:  (l)  THE DISPLAYS APPEAR TO BE WASHED-OUT BECAUSE

       PART OF THE LIGHT SPECTRUM IS REMOVED BY THE VISOR, AND (2) ON BRIGHT

       DAYS,  IT IS HARD FOR THE EYES OF AIRCREW MEMBERS TO READJUST TO THE

       LIGHT AVAILABLE INSIDE THE COCKPIT BECAUSE OF SHADOWS.  CROSS-CHECK

       FROM OUTSIDE TO REFOCUSING INSIDE ON COCKPIT DISPLAYS WAS REPORTED BY

       THE AIRCREWS AS CAUSING EYE STRAIN AND, IN A FEW CASES,  HEADACHES.

       C.  TWENTY-SEVEN PERCENT OF THE AIRCREWS SURVEYED FELT THAT THE

       BARNES VISOR DID NOT PROVIDE ADEQUATE SUN PROTECTION.  AIRCREW

       MEMBERS WERE UNABLE TO TRACK OTHER AIRCRAFT WITHIN 30 TO 40 DEGREES

       OF THE SUN.  DURING PERIODS OF BRIGHT SUNLIGHTI AIRCREW MEMBERS

       NOTICED THEY WERE FORCED TO SQUINT THROUGHOUT THE MISSION, WHICH

       CAUSED EYE STRAIN AND HEADACHES.  FOR THOSE AIRCREW MEMBERS THAT

       REQUIRED ADDED PROTECTION, IT IS AN ACCEPTABLE PROCEDURE TO WEAR THE

       AIR FORCE-ISSUED SUNGLASSES BENEATH THE VISOR TO RECEIVE INCREASED

       SUN PROTECTION.

       6-  IN ADDITIONI THE MAJORITY OF THE AIRCREWS NOTICED A CHANGE IN THE

       COLOR SPECTRUM, REDS LOOK ORANGE AND GREENS LOOK BLUE.  THE AIRCREW

       MEMBERS DID NOT CONSIDER THIS AS AFFECTING THEIR PERFORMANCE AND IT






                                         UNCLASSIFIED

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