TBR: Eye Question (Confusing)?

[justadream]

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TBR Bio I page 56 #69

"Light entering the eye will pass which of these cells first"

Answer: Ganglion cells
Other choices: rods, cones, bipolar cells

Explanation: "It is stated that both photoreceptors are located at the back of the retina. It clearly states that the four other types of cells (bipolar, etc.) are part of the retina. Since the photoreceptors synapse with the bipolar cells, and the bipolar cells synapse with the ganglia, one could create a picture in their head where the ganglion cells are furthest away from the photoreceptor cells, or the first layer of the retina. Based on this thought process, light entering the eye will first pass over the ganglion cells"


I am totally confused. It seems to me like ganglia cells are the LAST in the order described.

 

[techfan]

It seems backwards since it's easy to think that the light hitting the cones/rods happens and then sends the signal to the back of the eye, but if this was the case we wouldn't be able to catch the most amount of light. The back of the eye is pigmented so it absorbs the most light and you'd want the rods/cones there so the amount of light you miss would be minimal.

 

[justadream]

It seems backwards since it's easy to think that the light hitting the cones/rods happens and then sends the signal to the back of the eye, but if this was the case we wouldn't be able to catch the most amount of light. The back of the eye is pigmented so it absorbs the most light and you'd want the rods/cones there so the amount of light you miss would be minimal.

So are the lens and pupil and other stuff to the left in this picture?

 

[techfan]

Yup

 

[justadream]

@techfan

My mind = blown.

 

[techfan]

Yeah, it seems counter-intuitive since the stuff getting the signal (receptors) is behind the things sending the signal to the brain.