[opendtv] Re: Aspect Ratio
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "OpenDTV (E-mail)" <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 1 Nov 2004 16:08:35 -0500
Al Limberg wrote:
> Also, most of us have a right eye and a left eye
> with only portions of the visual fields overlapping.
And the "standard eye" structure supports this idea.
Since the nose presents an obstacle for perpiheral
vision, it looks like the retina has accommodated
this physical limitation, giving your left eye a lot
more peripheral vision to the left, and vice versa
the right eye.
-----------------------------------
http://www.4colorvision.com/standeye.htm#mosaic
Retinal Topography
Zones of the Retina (following Hogan, 1971)
....Central
Foveola 0.35 mm diam ~175 PC's in diam.
Fovea next zone out to 1.85 mm diam.
Parafovea next zone out to 2.85 mm diam.
Perifovea next zone out to 5.85 mm diam.
....Peripheral
Near periphery 1.5 mm zone around the central retina
Mid periphery 3.0 mm zone around near periphery
Far periphery 9-10 mm wide on temporal side, 16 mm
wide on nasal side=20
Ora serrata 2 mm wide on temporal side, 0.7-0.8 mm
wide nasally
....Macula (a.k.a. Macula Lutea)
Overlay of retinal area 2.0 mm. wide and 0.88 mm
vertically centered on the Fovea
------------------------------------
Far peripheral vision is handled by 16 mm of retina
from the fovea towards the nose, and only 9 to 10 mm
of retina from fovea on the side of the temples.
The lens, of course, causes the left to right
inversion, which is why the retina closer to the
nose gets to do the greater amount of peripheral
vision.
What this doesn't describe is how much far
peripheral vision is available vertically.
Evidently, less than horizontal peripheral vision,
else they would have given it a specific number.
Bert
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