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sci.med.vision |
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...@googlemail.com> wrote:
> > 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