Posts tagged ‘Eyes’

3D glasses made simple.

With the huge influx of 3D films exploding into cinema, it might be worth explaining the phenomenon of 3D glasses.

To fully understand the way 3D films and glasses work, we need to understand the basics of eyes:

How we perceive.

From the diagram, it’s easy to see that each eye perceives a slightly different image. Humans have an astounding perception of depth and distance – but only in their binocular field of vision. You can put this to the test yourself. If you try to catch a ball with both eyes open, you’ll most likely catch it fine (unless you’re awful at catching…). As soon as you close one eye, it becomes a whole new situation. You’ll find it much harder to catch, because your brain cannot correlate the images from both eyes to perceive the correct distance.

The brain works on the premise that the eyes are roughly 6 inches apart. This way, it uses the two images to come to a “conclusion” about what an image should look like. This helps us perceive the correct distance, depth and see things in 3D.

3D films work in the same way. Two images are projected on the screen at different positions – from very slightly different angles. Most recent films make use of “polarisation” technology; the images on the screen have been polarised to different wavelengths. The glasses you wear have polarised lenses as well. This means only one of the two images can enter each lens. One eye sees one image from one angle, and the other eye sees the remaining image from the other angle.

Speaking in psychological terms, this tricks the brain into believing what you are seeing is actually real. It correlates the two images, as it would in real life, and you perceive a virtual 3D world. It turns the two separate images and gives them a “meaning”; they are turned into a binocular image, allowing you to see distance and depth.

So next time you watch Avatar, Alice in Wonderland, and many of the other 3D films which are critically acclaimed, you know exactly why you’re seeing something that’s not actually 3D!

Samuel Eddy.


March 15, 2010 at 4:00 pm Leave a comment

Are you an eye expressions master?

A little bit of a fun post today!

I’m going to post some pictures of people’s eyes (I hope I don’t get murdered for copyright or something…?) and you need to guess (from the list) what expression they’re showing?

Sound simple? Think again. We like to think we’re amazing at interpreting faces, but we’re not as good as we first expect.
See how well you do – and don’t cheat!

1a) playful   b) comforting  c) irritated  d) bored

2a) joking   b) flustered   c) desire   d) convinced

3a) joking   b) insisting   c) amused   d) relaxed

4a) apologetic   b) friendly   c) uneasy   d) dispirited

5a) caution   b) insisting   c) bored   d) aghast

6a) terrified   b) amused   c) regretful   d) flirtatious

7a) disappointed   b) irritated   c) depressed   d) accusing

8a) decisive   b) amused   c) aghast   d) bored

9a) alarmed   b) shy   c) hostile   d) anxious

10a) serious   b) ashamed   c) bewildered   d) alarmed

11a) aghast   b) fantasizing   c) impatient   d) alarmed

12a) scared   b) anticipating   c) threatening   d) shy

13a) dominant    b) sceptical   c) friendly    d) scared

14a) embarrassed   b) serious   c) guilty   d) concern

15a) puzzled   b) nervous   c) insisting   d) contemplative

Ready for the answers?
Make sure you’ve given an answer for every one – if you haven’t, just pick what feels “right”.

1 – playful; 2 – desire; 3 – insisting; 4 – uneasy; 5 – caution; 6 – regretful; 7 – accusing; 8 – decisive; 9 – hostile; 10 – serious; 11 – fantasizing; 12 – anticipating; 13 – friendly; 14 – concern; 15 – nervous.

How well did you do?

The average is around 12-15, so if you did worse than this, your mastery of the eyes is yet to be realised!

Samuel Eddy.

March 12, 2010 at 4:00 pm Leave a comment

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