Class Note for OPTI 696D at UA
Popular in Course
Popular in Department
This 26 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at University of Arizona taught by a professor in Fall. Since its upload, it has received 18 views.
Reviews for Class Note for OPTI 696D at UA
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 02/06/15
Shack Hartmann Based Aberrometers amp Basic DirectShow Concepts 1 2 07 05 Prateek Jain Optical Sciences Center amp Dept of Ophthalmology The University of Arizona A Talk Outline Concepts Multiwavelength Shack Hartmann Aberrometer PEWE Pediatric Wavefront Evaluator DirectShow A Typical Values In the study done by Thibos et al regarding the aberration of the Human eye on group of 100 people they found 3lD mean spherical equivalent and standard deviation of 30D Although this study group was more myopic because it was chosen from the student body which more likely to be so The higher order aberration were less and averaged out to 0 but spherical aberration tended to be non zero and positive Chromatic Eye LM Red to Blue change of power is about 124D and in terms of focus position it is 025mm A Design Layout Afocal Imaging system Measurement channel l RE l IR Filter Rotating Wedge AA lt 455 532 630 v Alignment channel Optical Fiber A Effect of Rotating Wedge Wedge not rotating Rotating wedge A Astigmatism Simulations Defoe us Algorithm Spotarray 51 5253 s Us Algorithm Transfer slopes and reference spot locations to object space Generate the slope matrix based on the refrence spots Do the least square s fit A RGB Motivation Red to blue change in power is about 2 diopters Depth of focus maximization and chromatic aberration Accommodation and chromatic aberration Higher order aberration variation with wavelength um 3 Enrique J Fernandez et al Apparatus Human subjects protection program office approval required A Issues with Visible Light Reflectivity of retina at visible wavelength is less compared to infrared wavelengths Color CCD cameras are less sensitive as well putting more pressure on the signal strength Allowed power limit for the three wavelength separately is 50 W for 455 nm 400 W for 532 and 630 nm Power going in the eye was 10 W for 455 nm and 12 W for 630 and 532 nm Color Calculations A Chromatic Aberration of Lens R Achromatic doublet Singlet lens A Human Subject Data A Achromatization of the Eye A Achromatization of the Eye V M J L W 1 ff 71 39rW f i V agK L f f A Human Subject Data A PEWE Motivation Kids Unobtrusive A PEWE Screen Shot A DirectShow A component of Direct X 90 Microsoft DirectShow is an architecture for streaming media on the Microsoft Windows platform Complete SDK freely downloadable from Microsoftcom Does not work with QuickTime formats Apple A Why DirectShow Different camera different SDK Same application controls many cameras Optimized to exploit any hardware acceleration Don t have to worry about different media type formats A Hardware and DirectShow Camera or frame grabber driver based on WDM or the driver is specifically written for DirectShow Go digital instead of analog Some hardware do not support DirectShow Underlying Concept Component based programming x nnnnnn Av Sample Program Cut and past is the name of the game hr C oCreateInstanc eCLSID7FilterGraph NULL CLS CTXiIN39PRO CisERVER IIDilGraphBuilder Void ampp Graph hr pGraphgtQuery1nterfaceOIDilMediaConLrol Void amppConLrol hr AddFilterByCLSIDpGraph CLSIDiAsyncReader L File Readerquot amppFileReader hr pFileReadergtQuexyInterfaceOIDilFileSourceFilter VoidamppSource hr pSourc egtLoadc omp lenameNULL hr ConnecLFilterspGraph pFileReader pAVISplit hr pConLrolgtRun0 References The E e s MechanismsforAutocalibration Heidi Hoffer and David VWliams Optics amp Photonics News January 2002 Imperfect optics may be the eyes defence against chromatic blur James S McLellan et al Nature Vol 417 9 May 2002 Effects of longitudinal chromatic aberration on accommodation and emmetropization Anne Seidemann Frank Schaeffel Vision Research 42 2002 2409 2417 Ocular aberrations as a function of wavelength in the near infrared measured with a femtosecond laser Enrique J Fernandez et al 24 January 2005Vol 13 No 2 Optics Express
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'