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no rods at blind spot or fovea;
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greater distribution of rods at edge
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rods have high sensitivity / show retinal convergence /summation occurs with rods / converse
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for cones;
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rhodopsin .bleached. at low light intensities / iodopsin .bleached at high light intensities;
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higher frequency of rods;
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better vision in dim light;
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lower visual acuity;
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Exhibit high sensitivity due to the fact that many rod cells are attached to one neurone - spatial summation occurs so small generator potentials combine to reach the threshold value and create an action potential.
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because many rod cells are attached to one neurone two different spots of light close to each other cannot be distinguished as only one impulse is sent to brain.
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are spread evenly round more towards the edges of the retina.
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Have high visual acuity as each cone cell is attached to one neurone so different close light spots have separate impulses
•
Have low sensitivity as no summation occurs
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Are concentrated at the fovea
•
no rods at blind spot or fovea;
•
greater distribution of rods at edge
•
rods have high sensitivity / show retinal convergence /summation occurs with rods / converse
•
for cones;
•
rhodopsin .bleached. at low light intensities / iodopsin .bleached at high light intensities;
•
higher frequency of rods;
•
better vision in dim light;
•
lower visual acuity;
•
Exhibit high sensitivity due to the fact that many rod cells are attached to one neurone - spatial summation occurs so small generator potentials combine to reach the threshold value and create an action potential.
•
because many rod cells are attached to one neurone two different spots of light close to each other cannot be distinguished as only one impulse is sent to brain.
•
are spread evenly round more towards the edges of the retina.
•
Have high visual acuity as each cone cell is attached to one neurone so different close light spots have separate impulses
•
Have low sensitivity as no summation occurs
•
Are concentrated at the fovea
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