Vision and Perception

Vision and perception

What is a mach line? What makes it disappear?
To begin with, mach bands are an illusion that has to do with the eye. Mach bands consists of two bands, one that is light and one that is dark. The mach line is the line that separates two mach bands we see in an image. 

Draw and label a picture of the eye.
 

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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. Vision 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?

1.)Convex lens: Lens with a that curve outward. Convex Lens are used to see objects that are near you.

2.) Concave lens: Lens that has at least one surface that curves inward of the eye. This len is the one that is located in the 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?

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
The iris plays a main part in helping our eyes adjust to different light levels. For example, when a person is walking from a light room to a dark room, the iris constricts. In this way, the amount of light our eyes take in decreases. This is how our eye adapts to different light levels. To adapt to lower levels of light, the retina constricts and to adapt to higher light levels, the retina enlarges. 


Skip to visual fields
What is your visual gap?
There are flaws in our ability to perceive vision.


Explain retinal mapping and visual pathways.
Retinal mapping is the mapping of the whole retina. Visual pathways are routes the retina takes to get to the brain. The pathway has an optic nerve and an optic chiasm.

Describe three diseases of the eye.

Three diseases of the eye includes

1.) Glaucoma: A disease where the optic nerve is damaged resulting in possible blindness. 

2.) Cataracts: The clouding of lens. Symptoms include colors that appear to fade, blurry vision, and horrible night vision.

3.) Conjunctivitis: It is the inflammation of the conjunctiva, the tissue that lines the inside of the eye. Symptoms include and abundance in tears, red eyes, blurry vision, and itchy eyes.