Re: Stay away from "vision educators"

On 30 Mar, 16:25, Kevin <misa...@xxxxxxxxxxxxxx> wrote:
On 30 Mar, 13:41, Jan <lite...@xxxxxxxxxxxxxx> wrote:



Kevin,

With minus glasses of a higher power the peripheral visionfield has
MORE formation instead off less compared to myoops without glasses. In
a small angle they get the same information twice.(rimless frame)

With plus glasses (even rimless) they get less information. In a small
angle they could not "catch" a thing.

Asking this, should there be a difference in myopics and
hypermetropics wich we may not ignore speaking about the retina when
wearing glasses?

And what do you suggest if these myoops and hypermetroops wear
contactlenses? Do not say Bates has no answer, contactlenses are
already present at the time Bates wrote his book.
--
Jan (normally Dutch spoken)

On 30 Mar, 13:26, Kevin <lite...@xxxxxxxxxxxxxx> wrote:

In article <2zEYa.1631$vo2....@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
mty...@xxxxxxxxxxxxxx says...

Bates: "ALL glasses contract the field of vision to a greater or less degree."
Patently false. Minus spectacle lenses can increase the field of vision. They
don't always, but they certainly can be made to. Minus lenses minify, and more
objects are "drawn into" the field.

The area of useful sight for a person wearing glasses is reduced by
the simple fact that glasses do not extend to the edges of the visual
field. To say that more objects are drawn into the field skips the
point.

There are areas of visual information at the outer edges of the sight
which become discarded by the person wearing glasses. Frames
themeselves block light rays, and all rays beyond the edges of the
frames are no longer perceived as useful. The retina thus becomes
accustomed to working effectively over a contracted area. To say Minus
lenses minify is quite correct, - they draw more information into an
area of sight that has been contracted.

It is well known that in general all myopes have a deterioration at
the very edges of the retina as compared to people who have not worn
glasses.

An optometrist assumes that the deterioration is a result of being
myopic. I would suggest that the fact that the person is trained into
using a smaller area of the retina should not be ignored.

Kevin

Contacts in general have some advantages over glasses in that they
provide a slightly more normal experience for visual focusing.

I do understand that more visual information is available in the casw
of lenses for myopia, but you are skipping the point - the retinal
area used to see that 'greater visual information' is a smaller area
of the retina than if the whole eye is used without lenses.

Perhaps it would be clearer if I said, 'the area of visual information
which is perceived as useful by the subject takes up a smaller space
on the retina than on the retina of a person who uses their eyes
without glasses'. Stuff outside that clarity bubble that glasses
provide is generally disgregarded. The connection between eye and
brain of the reception of light on those retinal cells at the outer
periphery is thus ignored.

Kevin

You are still wrong and that stems from basic lack of understanding of
the physiology and neurology of the retina. I will be quite brief:

The peripheral retina photoreceptors do not care if the image is
focused or not. Their purpose is to "sense" form awareness and motion
detection.

So, " stuff outside the clarity bubble" is not ignored.

You might want to research the neuro function of the retina, as theren
are three separate systems there----the central fixation (focused
image expected), the certral visual field, paracentral extrafoveal
visual field and peripheral visual field.

--LB

--
Dr. Larry Bickford, O.D.
Family Practice Eye Health & Vision Care

The Eyecare Connection
http//www.eyecarecontacts.com
larrydoc at m a c.c o m


.

Relevant Pages

  • Re: A quiet afternoon
    ... when I'm wearing contact lenses - but I have had glasses break. ... Teeny-tiny frames were all the rage just then, so I thought I was up ... I miss the days when I was young enough to wear black frames -- they ...
    (rec.arts.sf.fandom)
  • Re: Jewellery question (now wandering [a] OT [b] to glasses)
    ... But I anticipate needing glasses within the next decade: I just resent the prices: I don't want "designer frames"; I can buy a very good pair of reading glasses for a pound, so the frames aren't the problem, and as for the lenses, I can buy an acceptable pair of binoculars for a lot less than the cheapest pair of glasses, so large coated lenses aren't it either. ... That is including the maximum discount I can get for him with NHS vouchers these days and they are not designer frames. ...
    (uk.media.radio.archers)
  • Re: Todays eye exam
    ... but not enough that it warranted new glasses. ... Unfortunately, I did need new glasses (lenses, not frames). ... continuous lenses, which is somewhat like trifocals but without any line ...
    (alt.support.diabetes)
  • Re: kids eye glasses
    ... Since dh and I don't wear glasses I know nothing about ... For the frames, I suggest plastic. ... You can get lenses that will darken in the sun, ...
    (misc.kids)
  • Re: Very OT: The Deed is Done!
    ... progressive lenses. ... The frames were only $40.00 of that. ... I also save old glasses and have some 4-5 decent frames that I ... progressives at the outset. ...
    (rec.food.cooking)