/usr/share/psychtoolbox-3/PsychOptics/ is in psychtoolbox-3-common 3.0.9+svn2579.dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/psychtoolbox-3/PsychOptics/AiryPattern.m
/usr/share/psychtoolbox-3/PsychOptics/ComputeDiffLimit.m
/usr/share/psychtoolbox-3/PsychOptics/Contents.m
/usr/share/psychtoolbox-3/PsychOptics/DiffractionMTF.m
/usr/share/psychtoolbox-3/PsychOptics/GoodmanDiffrac.m
/usr/share/psychtoolbox-3/PsychOptics/MakeRadiusMat.m
/usr/share/psychtoolbox-3/PsychOptics/WestLSFMinutes.m
/usr/share/psychtoolbox-3/PsychOptics/WestPSFDegrees.m
/usr/share/psychtoolbox-3/PsychOptics/WestPSFMinutes.m
/usr/share/psychtoolbox-3/PsychOptics/WilliamsMTF.m
/usr/share/psychtoolbox-3/PsychOptics/WilliamsRestMTF.m