How do you see?

alexlpeart
Flashcards by alexlpeart, updated more than 1 year ago
alexlpeart
Created by alexlpeart almost 8 years ago
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Sensation and Movment Flashcards on How do you see?, created by alexlpeart on 05/07/2013.

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Question Answer
Relaxing your ciliary muscles causes your lens to become ____. Contracting these muscles causes your lens to become ____. Fat, Thin
What is the smallest distance we can see called? Near point
What is being short sighted called and what does this mean in relation to where the light falls and the length of the eye. What lens would you need to fix this? Myopia, meaning the light will fall short of the retina and therefore the eye is too long. You could have to have a negative refractory effect so use a concave lens.
What is being long sighted called and what does this mean in relation to where the light falls and the length of the eye. What lens would you need to fix this? Hypermetropia, the light falls beyond the retina meaning the eye is too short. We would need a positive convex lens to fix this problem although we can also facilitate this problem by changing our internal mechanisms so our lens reduces the problem. This can lead to headaches however.
Why is the eye not like a camera? The retina changes everywhere you look at it i.e. we have different receptors all over it where as a camera has all the same type of receptor everywhere.
What is the point where we best see and where the majority of receptors are located? Fovea
What is the blind spot called in our eye? what causes it? The blind spot, we have no receptors here.
What type of receptor make up our peripheral vision and what type make up our fovea? Rods make up peripheral and cones make up fovea.
What type of receptor make up our peripheral vision and what type make up our fovea? Rods make up peripheral and cones make up fovea.
Describe the process of bleaching. The process where our rhodopsin is bleached by light meaning we have reduced sensitivity of our photo receptors. We become light adapted when lots of light falls on our eyes.
What is field adaption? Where more rods and cones are recruited so we can see more in the dark.
Out of the two adaptions to changing light conditions which is the fastest? adapting from light to dark is slowest and adapting from dark to light is fastest. This is because going from dark to light involved bleaching the rhodopsin which is a fast process where as field adaption is a slow process.
If we have such a small focus how can we see such a large range? Our eye scans round and adds the information together to form a clear image
When light passes thought the eye to the retina what does it pass through? Liquid, cornea, aqueous humor, lens
Where do all arteries and veins enter or leave the eye? Optic disk
In healthy people what is the purpose of light refraction? allow the light to fall upon the retina.
What eye muscles control the movement of the lens? Cilary muscles
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