The kids have been nagging you to go and see the latest 3D movie.    Have you ever wondered how 3D movies work?

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Polarized 3D glasses work the same way polarized sunglasses do, by filtering out light coming in from certain directions. The right lens is polarized at a different angle than the left, so a different image gets through each lens. Polarized 3D is superior to anaglyph 3D because it doesn’t make the film look dark and murky, and because it works for people who are colorblind!
Why does showing one image to one eye and another to the other eye, create the illusion of a 3D image? Because it’s the same way our eyes normally see! Try covering one eye, then the other. The image you see of the room you’re in is slightly different in each, because the perspective shifts a few inches from one eye to the other. When you look with both eyes, this difference gives you depth perception, meaning that you can tell how far away things are.
3D film technology works off this same principle. Normally, when we look at a flat image, our eyes can tell that it’s flat. Anagraph or polarized 3D glasses transform that flat image into two separate images, bringing out the depth in the scene as if we were looking through a window. It only works with film designed to be viewed in 3D, though, which is blurry and uncomfortable to look at without the 3D glasses.
Why Doesn’t It work For Everyone?
As cool as 3D film technology is, some people don’t get to enjoy it. For someone whose eyes don’t work together as an effective team, those 3D glasses won’t do anything, except maybe leave them with a headache, dizziness, or nausea! This actually makes 3D film a pretty good way to diagnose stereo blindness, or problems with eye teaming and depth perception.

Schedule An Eye Exam If 3D Doesn’t Work For You!
If you or someone you know has complained about an uncomfortable experience watching 3D films, it’s a good idea to schedule an eye exam to find out if this is the result of an eye problem.
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How can we assist patients with Low Vision?

Most people classified as blind still retain some ability to see. They often have significantly impaired vision but can discern light, shapes, or other figures. Low vision refers to a class of visual impairment that cannot be corrected by glasses or contact lenses.
What Is Considered Low Vision?
If you have a visual condition that prevents your visual abilities to be fully corrected to near 20/20, you may have low vision. Significant loss of visual field, such as the inability to see in peripheral areas, is also considered low vision.
Causes of Low Vision
It is usually a cluster of conditions that significantly impair visual abilities. Common causes of low vision include macular degeneration, diabetic retinopathy, retinal detachment, cataracts, or glaucoma. Many of these conditions are associated with aging, and older adults are more likely to experience low vision. However, traumatic brain injury, eye injuries, and some genetic conditions can cause low vision at any age.

Diagnosis and Treatment
A thorough optometry exam is the best way to diagnose low vision. Our Deidre de Jongh will test your visual acuity, visual fields, and ability to detect colour and contrast. Although by definition, low vision cannot be corrected by prescription glasses or surgery, some therapeutic options can help you continue activities of daily living. Magnifying devices, using large-print materials, and increasing contrast may facilitate everyday activities. Other aids, such as books-on-tape or talking watches may also be helpful. Let us help to come up with a plan to improve your quality of life despite low vision.
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If you experience any visual difficulties, please phone us to book a consultation on 012 998 7592/3