Retinal hemifields?

[Bathrover]

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From this image I can tell the optic disk is at the cross section of Y and Z but how come line W separates the hemiretinal fields (nasal and temporal)?
So this is image of the left eye and left of W (towards letter Z on image) would view temporal visual field and right of W would view nasal visual field?
Can someone explain it?

Wouldn't line Y separate the two retinal fields of vision?

 

[xhlmzr]

I'm a little confused by your question but from the orientation you provided, left of W would receive information from nasal side of your view and vice versa. Remember that the temporal side of each eye "sees" the nasal side of your view.

 

[Bathrover]

Which line separates the temporal and nasal retinal hemifields, is it line Y, V, or W. I thought it was line Y since that is the left eye..

 

[xhlmzr]

are you asking where on the retina does it switch from nasal to temporal information? there is no clear boundary and I've never seen it asked before but it should be somewhere near the optic disc (but not at the disc because remember that it is slightly deviated from the center) So I guess V would be a reasonable choice. I'm not 100% sure though

 

[DermViser]

Which line separates the temporal and nasal retinal hemifields, is it line Y, V, or W. I thought it was line Y since that is the left eye..

I don't know but this might help (or not): The hemiretinas are in relation to the fovea, not the optic disk. The nasal hemiretina is medial to the fovea and the temporal hemiretina is lateral to the fovea.

Source: Kandel - Principles of Neural Science http://homepage.psy.utexas.edu/HomePage/Class/Psy394U/Hayhoe/IntroSensoryMotorSystems/week1/Pages from Kandel - Principles of Neural Science Ch 27.pdf

 

[Bathrover]

So the intersection of the lines Z and W is the fovea (those dots on image), so this is the left eye looking towards the nose... and thus line W separates the temporal and nasal retinal fields...?

 

[Bathrover]

Compared to this image, the left eye as well. I guess what is confusing in the orginal image is that the fovea is at the edge of what is being shown.

 

[CherryRedDracul]

I don't know but this might help (or not): The hemiretinas are in relation to the fovea, not the optic disk. The nasal hemiretina is medial to the fovea and the temporal hemiretina is lateral to the fovea.

Source: Kandel - Principles of Neural Science http://homepage.psy.utexas.edu/HomePage/Class/Psy394U/Hayhoe/IntroSensoryMotorSystems/week1/Pages from Kandel - Principles of Neural Science Ch 27.pdf

And that's because the fovea is what corresponds to the center of your visual field. The optic disk corresponds to the blind spot.

 

[DermViser]

Compared to this image, the left eye as well. I guess what is confusing in the orginal image is that the fovea is at the edge of what is being shown.

How is that confusing? They haven't shown the entire dilated ophthalmoscope image in your original post.

 

[Mr. Mojo Risin]

How is that confusing? They haven't shown the entire dilated ophthalmoscope image in your original post.

Exactly, it is clear that the original picture is just zoomed in.