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Old 02-25-2011, 08:27 AM   #1
Shawn Casey
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severe myopia

Are there any crossfitters out there with severe myopia... if so, do you lift heavy? I've heard about retinal tears or detatchments from severe myopia.
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Old 02-25-2011, 08:54 AM   #2
Steven Low
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Re: severe myopia

You should probably talk to your doctor about this
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Old 02-25-2011, 10:03 AM   #3
Shawn Casey
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Re: severe myopia

I don't have it but I had someone that wants me to train them and they said they had severe myopia and I told the person they had to get cleared for me to train them...I'm just looking to see if anyone else has had this experience or is training with it.
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Old 02-25-2011, 10:08 AM   #4
Katherine Derbyshire
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Re: severe myopia

How severe? I'm in the 6 diopter range, which statistics say increases my risk, but not to the level where I'm going to let it affect my life.

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Old 02-26-2011, 06:13 AM   #5
Neil Kanterman
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Re: severe myopia

After speaking to a retina specialist colleague I was given the following answer:

The mechanism of retinal tear and detachment in high myopia is one of traction (or pulling) of the vitreous (jelly) inside the eye on the retina. As we get older, the vitreous gets less formed and more "liquid" and eventually pulls away from the retina on it's own (a process called PVD, which is normal and common). After the PVD has occurred, the risk of retinal tear and detachment drops, since there is no longer a mechanism for traction. Theoretically, high intensity exercise in younger people where the vitreous is violently shaken inside the eye when it is still tightly adherent to the retina, combined with the very thin retina in high myopia could put the eye at greater risk for a retinal tear and detachment. Exactly what that risk is, and how that risk should alter your decision to partake is a much tougher question to answer, unfortunately.
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Old 02-26-2011, 12:58 PM   #6
Darrell E. White
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Re: severe myopia

Well, well, well...another one I can safely chime in on! The following is meant to be used for general information. It should not be considered medical advice, diagnosis, or prescription. For that you should consult your personal physician.

High myopia (definitions and limits vary) does indeed come with a higher incidence of retinal holes, tears, and detachments. As Neal noted (quite well!), it is anterior->posterior vitreal traction that is the most common cause of a hole or tear, and a total separation of the shrunken vitreous from the retina dramatically reduces the risk of a retinal detachment...no more traction. This is a very common aging change, and it takes place much earlier in life in high myopes (higher the myopia the earlier it typically happens).

You can have a Posterior Vitreal Detachment (PVD) in youth from trauma; I have it in both of my eyes from tackling people with my head in football. Very violent acceleration or deceleration (think car accident) can shake the vitreous loose and cause a tear, but our CF exercises are comparable to LSD running and typical gym weight lifting when it comes to your retina, myopia or not. I would (and have) tell one of my own patients that none of the non-contact higher intensity exercise regimens like Crossfit is an increased risk for holes, tears, or detachments in the high myope. I believe the risk remains the same, and there has been exactly no published research on the topic either way.

Hope that helps.

--bingo
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Old 02-26-2011, 09:27 PM   #7
Neil Kanterman
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Re: severe myopia

Quote:
Originally Posted by Darrell E. White View Post
Well, well, well...another one I can safely chime in on! The following is meant to be used for general information. It should not be considered medical advice, diagnosis, or prescription. For that you should consult your personal physician.

High myopia (definitions and limits vary) does indeed come with a higher incidence of retinal holes, tears, and detachments. As Neal noted (quite well!), it is anterior->posterior vitreal traction that is the most common cause of a hole or tear, and a total separation of the shrunken vitreous from the retina dramatically reduces the risk of a retinal detachment...no more traction. This is a very common aging change, and it takes place much earlier in life in high myopes (higher the myopia the earlier it typically happens).

You can have a Posterior Vitreal Detachment (PVD) in youth from trauma; I have it in both of my eyes from tackling people with my head in football. Very violent acceleration or deceleration (think car accident) can shake the vitreous loose and cause a tear, but our CF exercises are comparable to LSD running and typical gym weight lifting when it comes to your retina, myopia or not. I would (and have) tell one of my own patients that none of the non-contact higher intensity exercise regimens like Crossfit is an increased risk for holes, tears, or detachments in the high myope. I believe the risk remains the same, and there has been exactly no published research on the topic either way.

Hope that helps.

--bingo
Hey Darrell, thanks for chiming in...on a side note, I plan on taking a stab at your Fittest Eye Doc Challenge. Unfortunately I can't be in San Diego, but I'll be doing the challenge soon and I'll be sure to get it on video. Pediatric Ophthalmologist in South Florida, by the way.
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Old 02-27-2011, 09:10 AM   #8
Shawn Casey
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Re: severe myopia

Thanks everyone...I'll take all this into consideration in my decision.
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