Saturday, April 28, 2012

Vision And Perception

Vision and perception


What is a mach line? What makes it disappear?

It is the optical illusion produced by the retina of the eye. 



Draw and label a picture of the eye.



Explain what refraction is and how it relates to vision.
It is the phenomenon of the light, radio waves, etc that gets deflected due to it's speed. It has to do with refraction because it measure the eye's refractic error, which is farsightedness or nearsightedness. 




What are the two kinds of lenses? Which is in your eye?
Convex lens are lens with a curved shape. There are also the concave lens. The lens in our eyes is the human eye. 



What are rods and cones and what do they do? Where are they located in your eye?
Cones is what perceives color and they are located in the fovea. Rods are photoreceptor cells that are responsible for seeing when there is little light, which is called scotopic vision. 



What are the steps of phototransduction?
File:Phototransduction.png 

The first step to phototransduction is the incident photon and it triggers the rhodopsin by changing the disk membrane. The next step is that the R* makes interaction with the 
transducin molecules, which activates the G* from the release of GDP which turns into GTP. 



How do your eyes adjust to different light levels




Skip to visual fields
What is your visual gap?



Explain retinal mapping and visual pathways.


Describe three diseases of the eye.
Three diseases of the eye includes
1.) Conjunctivitis: There are three types of Conjunctivitis are viruses, bacteria, and allergies. It is disease where the conjunctiva is inflamed.  
2.) Glaucoma: Damages the optic nerve and can lead to blindness 
3.) Trachoma: It is a disease where eyelids turn inward, and so that eyelashes touch one's eye. It can lead to blindness. 

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