glowingshutter
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I get the same problem, and I've started threads on this before on photography forums years ago. The blurriness generally lasts for a few days for me, and it can get pretty bad, where my vision is markedly deteriorated.
The issue is that when you force yourself to keep one eye open, you're generating excessive pressures on the eye that's being closed. This isn't at all the same situation as when you close both eyes simultaneously or you apply some sort of patch to one eye. The act of keeping only one eye open through the actions of the muscles of your eyelids is completely unnatural from an evolutionary perspective. There's simply no natural reason for this to happen, and we're not designed to do this for prolonged periods. The muscles that control our eyelids are designed to work on both eyes simultaneously. When you attempt to only close one eye, the pressures can be far greater than doing both simultaneously
Prolonged and repetitive exposures (over years) to the kinds of elevated intraocular pressures generated by this unnatural process can potentially lead to long-term damage to the eye that's being closed. Even if it's being done for brief periods every day, I can imagine that long-term damage can occur if you're doing it consistently for years.
No studies to prove this you might say? Just because something hasn't been studied doesn't mean it's not a real issue. When you have blurry vision for multiple days due to elevated pressure applied acutely, you're going to do damage if you keep repeating the initiating action day in and day out over months or years. Many occupational hazards are simply not common enough to ever be studied, and this is probably one of them.
I can imagine that some people are better able to regulate the pressure on their "off-eye" than others when looking through a VF. But if you're getting blurry vision after doing this, you're not one of those people. And I can't say that people who don't experience blurry vision aren't generating excessive pressures, just that people who do get blurry vision probably are.
The issue is that when you force yourself to keep one eye open, you're generating excessive pressures on the eye that's being closed. This isn't at all the same situation as when you close both eyes simultaneously or you apply some sort of patch to one eye. The act of keeping only one eye open through the actions of the muscles of your eyelids is completely unnatural from an evolutionary perspective. There's simply no natural reason for this to happen, and we're not designed to do this for prolonged periods. The muscles that control our eyelids are designed to work on both eyes simultaneously. When you attempt to only close one eye, the pressures can be far greater than doing both simultaneously
Prolonged and repetitive exposures (over years) to the kinds of elevated intraocular pressures generated by this unnatural process can potentially lead to long-term damage to the eye that's being closed. Even if it's being done for brief periods every day, I can imagine that long-term damage can occur if you're doing it consistently for years.
No studies to prove this you might say? Just because something hasn't been studied doesn't mean it's not a real issue. When you have blurry vision for multiple days due to elevated pressure applied acutely, you're going to do damage if you keep repeating the initiating action day in and day out over months or years. Many occupational hazards are simply not common enough to ever be studied, and this is probably one of them.
I can imagine that some people are better able to regulate the pressure on their "off-eye" than others when looking through a VF. But if you're getting blurry vision after doing this, you're not one of those people. And I can't say that people who don't experience blurry vision aren't generating excessive pressures, just that people who do get blurry vision probably are.
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