How does eye strain affect the length of the eyeball?

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Discussion Overview

The discussion revolves around the relationship between eye strain and the length of the eyeball, particularly in the context of myopia (short-sightedness) and hyperopia (far-sightedness). Participants explore whether eye strain can influence the anatomical changes in the eyeball and the implications of prolonged visual tasks.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants question how eye strain could affect the length of the eyeball, given that short-sightedness is associated with an elongated eyeball and far-sightedness with a shorter one.
  • One participant suggests that while there may be a correlation between eye strain and eye length, age-related factors are typically attributed to changes in vision.
  • Another participant proposes that normal eye strain from focusing on objects for extended periods does not damage the eyes or alter their anatomy, although they express uncertainty about the effects of straining to see at short distances.
  • A different viewpoint indicates that eyestrain may be more related to muscle fatigue rather than changes in eyeball shape, referencing a study on eye-related pain from visually demanding tasks.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between eye strain and changes in eyeball length, with no consensus reached on whether eye strain can lead to anatomical changes in the eye.

Contextual Notes

Some claims rely on assumptions about the effects of eye strain and the mechanisms of myopia and hyperopia, which remain unresolved in the discussion.

BHL 20
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Ever since I learned that short-sightedness is due to the eyeball being too long, and far-sightedness is due to the eyeball being too short, I've wondered what the point of avoiding eye strain is. How could straining the eyes possibly have the effect of changing the length of the eyeball? By strain I mean both trying to see things very far away and close-up; and the continued use of eyes when they are tired.
 
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While there may be a correlation, the usual cause attributed to such is age related. Muscle stress may be essential to proper function of the muscle, including muscles of the eye.

You do know that strain is dl/l?
 
BHL 20 said:
Ever since I learned that short-sightedness is due to the eyeball being too long, and far-sightedness is due to the eyeball being too short, I've wondered what the point of avoiding eye strain is. How could straining the eyes possibly have the effect of changing the length of the eyeball? By strain I mean both trying to see things very far away and close-up; and the continued use of eyes when they are tired.
I think Doug is correct, myopia often develops with age. As far as I know, normal eye strain (simply focusing on objects for a rather long time) won't damage the eyes or change their anatomy in any way. Apparently however, straining on distances at short range (aka a computer screen) can result in the eye to lengthen and thus near nearsightedness to progress, but I wouldn't know if that is for sure o_O. If it is, then I should probably get off of the internet so I don't become blind.. Hope this helps.
 
BHL 20 said:
Ever since I learned that short-sightedness is due to the eyeball being too long, and far-sightedness is due to the eyeball being too short, I've wondered what the point of avoiding eye strain is. How could straining the eyes possibly have the effect of changing the length of the eyeball? By strain I mean both trying to see things very far away and close-up; and the continued use of eyes when they are tired.

Eyestrain appears unrelated to the shape of the eyeball- it seems to be fatigue in the muscle that controls blinking:

http://journals.lww.com/optvissci/A...ed_Pain_Induced_by_Visually_Demanding.13.aspx
 

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