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The Back of a Spoon

This is a discussion on The Back of a Spoon within the Bifocal Contact Lenses forums; When trying to explain what astigmatism is, many people say that it's due to the ...


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  #1 (permalink)  
Old 06-17-2008, 11:48 AM
Contact Lenses Forum - Bachelors Degree
 
Join Date: Dec 2007
Posts: 480
Default The Back of a Spoon

When trying to explain what astigmatism is, many people say that it's due to the cornea being shaped more like a football than a baseball.
Then I read the description that said that an astigmatic cornea is shaped like the back of a spoon.
Do we have any experts here that can agree with that analogy?
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Old 07-07-2008, 01:14 PM
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Default

I don't know too much about astigmatism.
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Old 10-08-2009, 12:09 PM
Contact Lenses Forum - Bachelors Degree
 
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Default Um . . . Thanks

Quote:
Originally Posted by guru View Post
I don't know too much about astigmatism.
Okay . . . thanks for playing. I'm afraid I don't have any lovely parting gifts for you.

Okay, is there anyone out there who DOES know about astigmatism and can tell me about this spoon thing?
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Old 10-08-2009, 12:31 PM
catt
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Quote:
Originally Posted by Hypnoteyes View Post
When trying to explain what astigmatism is, many people say that it's due to the cornea being shaped more like a football than a baseball.
Then I read the description that said that an astigmatic cornea is shaped like the back of a spoon.
Do we have any experts here that can agree with that analogy?
I am by no means an expert on astigmatism (although I am proported to have a slight case of it), but, I did post this test somewhere here on the board yesterday. It's fairly self-explanatory.

Quote:
If you want to know whether you have astigmatism, try taking this test. Then see your O.D. to confirm it.

The Astigmatism test
What is it?
An astigmatism chart helps determine whether the curvature of your cornea or lens is normal. An abnormal curvature, usually more football-shaped than round, will sharply focus some portions of an image onto the retina while blurring others.

How do I do it?
1.If you have contacts or glasses, wear them.
2.Sit about 14 inches away from your computer screen.
3.Cover one eye.
4.Note how the lines and squares appear (for example, wavy or blurred).
5.Test the other eye in the same manner.

What do my results mean?
To a normal eye, the lines will appear sharply focused and equally dark. If some sets of lines appear sharply focused and dark while others are blurred and less dark, you may have astigmatism. Regardless of your result, see your eye doctor on a regular basis for a complete eye exam.

Last edited by catt; 08-06-2010 at 10:52 PM..
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Old 10-08-2009, 01:42 PM
Contact Lenses Forum - Bachelors Degree
 
Join Date: Nov 2007
Posts: 442
Default Am I Doing This Right?

Hmmm . . .

According to my last check up in May, I do have astigmatism, but when I look at the test pattern with one eye covered, the lines look fine. I must be doing something wrong. Do you have a demonstration of what a person with astigmatism would see? Maybe I'm just not seeing what I'm seeing.

Now I'm starting to sound like Yogi Berra. "When you get to a fork in the road, take it."
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Old 10-22-2009, 03:21 PM
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Join Date: Dec 2007
Posts: 480
Default A Fudged Pattern

Quote:
Originally Posted by dragongirl81 View Post
Hmmm . . .

According to my last check up in May, I do have astigmatism, but when I look at the test pattern with one eye covered, the lines look fine. I must be doing something wrong. Do you have a demonstration of what a person with astigmatism would see? Maybe I'm just not seeing what I'm seeing.

Now I'm starting to sound like Yogi Berra. "When you get to a fork in the road, take it."
"Fork in the road." I get it!

Anyway, here's a picture of that test pattern that has been "fudged" (in the words of the website) to show what what a person with astigmatism would see.

This site also defines astigmatism in a unique way: "Astigmatism occurs when the surface of the cornea or of the lens is not perfectly smooth. If, for example, there is a small flat spot on your cornea the image in a certain direction on your retina will not be in perfect focus."
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