sight Flashcards
What percentage of our brain is devoted to processing visual information?
Almost 30%
What are specialized receptor cells that convert electromagnetic radiation to a biological response called?
Photoreceptors
What is the process by which photoreceptors communicate their biological response?
Through intermediate relay cells (bipolar cells)
What type of cells communicate information from bipolar cells to the brain?
Retinal ganglion cells
What is the outermost layer of the eye called?
Sclera
What is the function of the Choroid layer in the eye?
It is a vascular layer that supports the eye and forms the ciliary body
What does the ciliary body consist of?
- Muscles
- Processes
- Ligaments
What is the innermost layer of the eye that holds the photoreceptors?
Retina
What is the transparent structure behind the Iris called?
Lens
What fills the inside of the eye behind the lens?
Vitreous Humor
What fluid is found in the anterior chamber of the eye in front of the lens?
Aqueous Humor
What phenomenon occurs when there is a change in the density of the medium?
Refraction
Where does the major site of refraction occur in the eye?
At the interface between air and the cornea
What type of lens causes light rays to converge?
Convex lens
What is Myopia?
A condition where light rays are focused in front of the retina
How can Myopia be corrected?
By using a concave lens to cause light rays to diverge
What type of lens is used to correct for hyperopia?
Convex lens
Fill in the blank: Refraction occurs at the front interface between the ______ and the lens.
Air
