- #1
kompabt
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(I have myopia.)
Why can I see sharply through a very little hole?
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SUMMARY
The discussion explains the optical effect of seeing clearly through a small aperture, specifically in relation to myopia. It highlights that using a pin-hole camera demonstrates this effect, as it minimizes errors in the eye's lenses by restricting the angle of incoming light. The phenomenon is exacerbated in low light conditions when pupils dilate, leading to worsened vision. Additionally, the discussion references the relationship between aperture size and depth of field in photography, emphasizing the importance of aperture in achieving desired focus.
PREREQUISITES- Understanding of myopia and its effects on vision
- Basic knowledge of optical principles, specifically spherical aberrations
- Familiarity with pin-hole camera concepts
- Awareness of photography techniques related to aperture settings
- Research the effects of spherical aberrations on vision
- Explore the principles of pin-hole cameras and their applications
- Learn about the relationship between aperture size and depth of field in photography
- Investigate corrective measures for myopia, including lens options
Individuals with myopia, optical physicists, photographers, and anyone interested in understanding the relationship between light, vision, and photographic techniques.
- #2
turbo
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Google on pin-hole camera for an explanation of the optical effect. Pin-hole cameras are slow because they let very little light through, and the images they make are a bit soft.
As for your eyes, by restricting the angle of incidence in incoming light (looking through a pin-hole) you're minimizing the errors in your eyes' lenses. You may have noticed that when the light is dim and your pupils dilate as a result, your vision gets even worse than in daylight. This is typical.
As for your eyes, by restricting the angle of incidence in incoming light (looking through a pin-hole) you're minimizing the errors in your eyes' lenses. You may have noticed that when the light is dim and your pupils dilate as a result, your vision gets even worse than in daylight. This is typical.
- #3
DaveC426913
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Here's a thread from a year ago that describes the phenom. Look particularly at post #2.
https://www.physicsforums.com/showthread.php?t=286199
https://www.physicsforums.com/showthread.php?t=286199
- #4
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While reduced spherical aberrations play a role, a smaller aperture results in less blurring for objects that are not in focus. I hope this picture illustrates the effect clearly enough:
This is also why photographers use smaller apertures to get a larger depth of field, or large apertures for a narrow depth of field.
This is also why photographers use smaller apertures to get a larger depth of field, or large apertures for a narrow depth of field.
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