AOA "There's More to 3D than Meets the Eye"
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The American Optometric Association did an awesome job in making a potentially hard to understand topic...easier to understand. If you have problems with viewing 3D, please review this PowerPoint presentation.
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AOA "There's More to 3D than Meets the Eye"
- 1. There’s MoreThere’s More toto 3D than Meets3D than Meets the Eyethe Eye
- 2. The Basics: How Do WeThe Basics: How Do We See?See?
- 3. What do you need to see inWhat do you need to see in 3D?3D?
- 4. StereopsisStereopsis http: //www.visio n3d.co m /im ag e s/bb. jpe g
- 5. 3D Imagery3D Imagery Commonplace experience forCommonplace experience for every sector of ourevery sector of our
- 6. How 3D DisplaysHow 3D Displays WorkWork The main viewing technologies haveThe main viewing technologies have evolved, for front projection, rearevolved, for front projection, rear projection, and modern TV 3Dprojection, and modern TV 3D presentations:presentations:
- 7. How 3D Displays Work
- 8. Why is Seeing3D Important?Why is Seeing3D Important?
- 9. Understanding the 3D ViewingUnderstanding the 3D Viewing ExperienceExperience Is it unco m fo rtable watching 3D?Is it unco m fo rtable watching 3D?
- 10. Causes of 3D Viewing ChallengesCauses of 3D Viewing Challenges
- 11. Causes of 3D Viewing ChallengesCauses of 3D Viewing Challenges
- 12. Causes of 3D Viewing ChallengesCauses of 3D Viewing Challenges
- 13. Causes of 3D Viewing ChallengesCauses of 3D Viewing Challenges
- 14. Causes of 3D Viewing ChallengesCauses of 3D Viewing Challenges
- 15. 3D Benefits – A Public Health Tool3D Benefits – A Public Health Tool Am e rican O pto m e tric Asso ciatio n, alo ng with o the r visio n he alth pro fe ssio nals, has state d publicly that – thereis NOevidencethat viewingor attemptingtoview 3Dimages willharmachild’s eyes Fo r an e stim ate d 1 in 4 childre n, and m illio ns o f adults – difficulties with3Dviewingcan unmask undiagnoseddeficiencies & leadto treatment
- 16. Glasses orcontact lenses forsimple refractive error Glasses to improve eye-focusing oreye coordination Treatment foramblyopia orstrabismus Optometric vision therapy to help teach eye coordination Treatment OptionsTreatment Options
- 17. Questions?Questions? Special thanks to: James Sheedy, O.D., Ph.D. for use of content & images 3D in the Classro o m : Se e We ll, Le arn We ll Editorial Committee for assistance with content FORMORE INFORMATION VISIT WWW.3DEYEHEALTH.COM Forinformation, diagnosis and treatment of eye and vision problems associated with 3Dviewing difficulties go to http://www.LyonsFamilyEyeCare.com My thanks to the AOA and all who made this presentation. I can highly recommend the booklet 3D in the Classroom: See Well, Learn Well (I’mbiased of course because I helped to create this informational resource. Go to http://aoa.uberflip.com/i/203445-3d-in-the-classroom DominickM. Maino, OD, MEd. FAAO, FCOVD-A
Editor's Notes
- To understand 3D, it’s important to have a basic understanding of how our wonderful vision works – how do we see? First, light enters through the clear covering of the eye called the cornea. The cornea bends or refracts the rays that pass through a round opening called the pupil. The iris, or colored portion of the eye that surrounds the pupil, opens and closes to regulate the amount of light passing through. The light rays then pass through the lens, which bends the rays and focuses them on the retina at the back of the eye. The optic nerve sends the impulses to the brain where an image is produced.
- The main viewing technologies have evolved, for front projection, rear projection, and modern TV 3D presentations: Anaglyph – the viewer wears glasses with different colored filters (usually red & blue) placed in front of each eye. The two stereo images – left eye and right eye – are also colored red & blue. In theory, each eye will therefore only see the image intended for it. Passive Polarized – the viewer wears glasses with oppositely polarized filters placed in front of each eye. The two stereo images are also projected through oppositely polarized filters, so that each eye only sees the view intended for it. Active Shutter – the viewer wears battery powered glasses that receive signals from the TV equipment, or classroom projector; the lenses alternately ‘occludes’ each eye in synchrony with the alternating images being display. This occurs 120 times a second—too fast to be perceived by the viewer. “Glasses Free” (also known as ‘autostereoscopy') – currently, this technology works best in displays that are viewed at close distances and in carefully controlled environments (hand-held devices).
- REFRACTIVE PROBLEMS – nearsightedness (myopia), farsightedness (hyperopia), and astigmatism (image is blurred no matter where you look) can all interfere with 3D viewing. LACK OF BINOCULAR VISION (Strabismus) – when the two eyes are not properly aligned, a strabismus (eye turn) is present. With this condition, the inputs from the two eyes are not successfully combined in the brain and a 3D stereoscopic perception will not occur.
- LAZY EYE (Amblyopia) – one eye dominates the other and vision signals from the non-dominant eye are ignored. The result is, effectively, monocular vision. People with amblyopia do not experience stereopsis and need diagnosis and treatment as early as possible. Before using 3D viewing as a risk assessment tool, many children with conditions causing amblyopia went undetected and untreated.
- EYE COORDINATION DIFFICULTIES (such as Convergence Insufficiency’) – difficulty in keeping the two eyes aligned with one another. This can result in seeing double, eye fatigue, and the avoidance of close up work, such as reading. The quality of the 3D viewing experience can also be compromised.
- EYE FOCUSING (Accommodation) DIFFICULTIES – our eyes need to precisely change their focus (or “accommodate”) when we view objects at different distances. Individuals having difficulty in performing this function can experience symptoms of blur, headache and discomfort when viewing 3D displays.
- DIZZINESS AND NAUSEA – can be caused by rapid motion effects in the 3D content. These vision-induced sensations of movement disagree with the “vestibular,” or balance system which informs the individual that s/he is not moving. This confliction sensory information can cause vision-induced motion sickness.
- The American Optometric Association, along with other vision health professionals, has stated publicly that there is no evidence that viewing or attempting to view 3D images will harm a child’s eyes The good news is that for the estimated 1 in 4 children, and millions of adults, with an underlying vision issue, difficulties with 3D viewing can unmask previously undiagnosed deficiencies, leading to treatment.