Oct

24

Vision Tips And Facts

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Magical Night…Without Night Blindness…
Always be Pro-Active In Your Vision Management

  • Other Names For Night Blindness:1. Nyctanopia
    2. Nyctalopia
  • Night Blindness affects up to 100,000 Americans

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VisionTip: Protect your eyes

‘Snow blindness’ (photokeratitis) is sunburn damage to the cornea of the eye caused by UV radiation.

This painful condition can be associated with temporary vision loss for up to 48 hours. It is thought that UV exposure may contribute to other eye conditions including cataracts, pterygium and age-related macular degeneration. Suggestions on protecting your eyes include:

  • Always wear wraparound sunglasses or goggles. Aim for a snug fit, so that sunlight can’t shine over the top or sides of your eyewear.

  • Choose eyewear that meets the Australian Standard AS1067. This means that the glasses will block 95 per cent of UV radiation.

  • Yellow or brown tinted lenses are more effective at counteracting the ‘blue’ glare on snow.

  • Sunglasses and goggles can be fitted with prescription lenses, if necessary. See your optometrist for more information.

  • Brimmed hats can block at least half of UV radiation from reaching the eyes.

 

Oct

22

National Color Day - Celebrate Your Vision

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Celebrate by caring for your eyesight.Color and our perception of it

http://www.youtube.com/watch?v=kDs7OHuZ2N0

Celebrate by caring for your eyesight. Be Pro-Active!

Oct

22

Optical Illusions - Tricks Of The Eye

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Optical Illusions

optical illusions

Visual perception cannot always be trusted.

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This is possibly one of the most uncanny optical illusions in existence. No matter how hard you look, you may not be able to convince yourself that the two squares are the identical shade of grey.

To check, try one of these methods:
Right click the large picture, save it to your hard drive, put it into your image editor, “select” square A and then pull it down onto square B. There will be an exact match in colour!
Perhaps even easier than the above, if you place your finger covering the two to three squares that separate A and B, it can clearly be seen that they are the same color. In other words, forcefully ignoring the borders between the squares.

Perception

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- Amodal perception is the term used to describe the full perception of a physical structure when it is only partially perceived. For example, a table will be perceived as a complete volumetric structure even if only part of it is visible; the internal volumes and hidden rear surfaces are perceived despite the fact that only the near surfaces are exposed to view.

- Color perception - see the article here

- Depth perception is the visual ability to perceive the world in three dimensions. It is a trait common to many higher animals. Depth perception allows the beholder to accurately gauge the distance to an object.

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