Why can I see sharply through a very little hole?

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Discussion Overview

The discussion centers around the optical phenomenon of seeing sharply through a very small hole, particularly in the context of myopia and the mechanics of light and vision. Participants explore the implications of aperture size on image clarity and depth of field, referencing both personal experiences and photographic principles.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant mentions having myopia, suggesting a personal context for the discussion.
  • Another participant explains that pin-hole cameras illustrate the optical effect, noting that they produce softer images due to limited light intake and that the restriction of light angle minimizes lens errors in the eyes.
  • A reference is made to a previous thread that discusses the phenomenon in more detail, indicating ongoing interest in the topic.
  • It is proposed that reduced spherical aberrations contribute to improved clarity through a smaller aperture, with an emphasis on the relationship between aperture size and image blurring for out-of-focus objects.
  • A participant connects the discussion to photography, explaining how aperture size affects depth of field, suggesting that smaller apertures increase depth of field while larger apertures decrease it.

Areas of Agreement / Disagreement

Participants present multiple viewpoints regarding the mechanisms behind the optical effects of small apertures, and while some concepts are shared, no consensus is reached on the primary reasons for the observed clarity.

Contextual Notes

Participants discuss various aspects of optical theory without resolving the complexities of how different factors interact, such as the specific contributions of spherical aberrations and the effects of light intensity on vision.

kompabt
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(I have myopia.)
 
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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.
 
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:

ApertureEffectEye.gif

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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