MIni book review: specialized but worth reading
13 hours ago
b2d: a blog about (1) trying to understand how we work, in terms of health, fitness and well-being (2) sharing that understanding (3) trying to figure out or review best practice to optimize and operationalize (ie make it work) that practice for us.
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| Snellen myopia diopters of blur |
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| Snellen Eye Chart |
I am standing or sitting 10 feet away (effectively half the standard distance away) from a full chart (explained) - something called the ETDRS which is supposed to be a better measure of acuity than Snellen (so what? it's less blurry standing here at this line than yesterday). It gets used in research a lot; i like it cuz it fits on a sheet.
When i get better than the 10ft line on that one (equivalent to the 20ft line if i were 20 feet away), i'll go to the 50% chart and keep my ten foot distance. I'm just about there but i'd like a more consistent lock on those letters in that line.
ETDRS visual acuity chart
Contrary to scientific fact, Bates taught that errors of refraction are due, not to the basic shape of the eyeball or the structure of the lens, but to a functional and therefore curable derangement in the action of the muscles on the outside of the eyeball. All defects in vision, he said, were caused by eyestrain and nervous tension; and perfect vision could be achieved by relaxing the eyes completely. Bates warned that eyeglasses cause the vision to deteriorate; he also deplored the use of sunglasses. Bates claimed his exercises could correct nearsightedness, farsightedness, astigmatism, and presbyopia (the inability of older people to focus their eyes on nearby objects). They could also cure such diseases as cataracts, eye infections, glaucoma, and macular degeneration. His exercises included palming (covering the eyes and attempting to see blackness) and shifting or swinging the gaze from object to object.
It should be obvious that these exercises cannot influence eyesight disorders as Bates claimed. Nearsightedness, farsightedness, astigmatism, and presbyopia result from inborn and acquired characteristics of the lens and the eyeball—which no exercise can change. [sic, and emphasis mine -mc] As for eye diseases, the only thing the exercises can do is delay proper medical or surgical treatment and result in permanent impairment of vision.Really? Like, really? I am for sure a vision can be improved skeptic - just because it's likely best protection against failure "see - i knew it wouldn't work; not cuz i didn't do it right but because, well, it's just because." But work in neurology amply teaches us we're plastic people and so adapt all the time, and that vision is cognitive. There's a lot happening and being coordinated between the moment light hits the lens and that light is perceived as something in the mind. A lot of opportunities to improve clarity.
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2 comments:
Hey, mc, have you looked into plus lens therapy at all? The basic concept is to use plus lenses when you are nearsighted (minus lenses on glasses) to force an opposite adaptation. I haven't tried it yet, although I bought cheap plus lenses already. Seems highly promising!
Here is a link on Getting Stronger - http://gettingstronger.org/2012/04/how-one-person-improved-his-vision/
Rock on!
Hi Indrek,
Thanks for the ref.
yes i've been reading about plus lenses via daniel ormid's recommendation of klaus schmid's overview here: http://www.myopia-manual.de/.
In his pdf, Schmid says that one can achieve the same effect, apparently, simply by holding a book/screen further away from oneself (same as the increased diapoter).
mc
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