Chapter 9: The Eye Flashcards
Study of light rays and their interactions
Optics
Bouncing of light rays off a surface
Reflection
Transfer of light energy to a particle or surface
Absorption
Bending of light rays from one medium to another
Refraction
opening where light enters the eye
Pupil
white of the eye
Sclera
gives color to eyes
Iris
glassy transparent external surface of the eye
Cornea
3 pairs the move the eye in its orbit
Extraocular muscles
bundle of axons from the retina
Optic Nerve
- suspended by ciliary muscles
- divides interior of eye into two
compartments with different fluids
Lens
- watery
- nourishes cornea
- High pressure reduces blood
supply and damages
retina»glaucoma
Aqueous Humor
- jelly-like
- keeps eye-ball spherical
- 80% of volume of the eye
- Contains phagocytic cells that remove debris
- Source of “floaters”
Vitreous humor
Tests fidelity of connections between retina and brain stem neurons that control muscles around pupil
Pupillary Light Reflex (PLR)
shining a light into one eye causes constriction of both pupils
Consensual
a layer of photoreceptors cells and glial cells within the eye that captures incoming photons and transmits them along neuronal pathways as both electrical and chemical signals for the brain to perceive a visual picture
Retina
Center of retina
Fovea
also known as the optic disk; has no photoreceptors and is the origin of vessels; In this area there are no light-sensitive cells so this part of your retina can’t see.
Blind spot
anatomical term of the retina: closer to nose
Nasal
anatomical term of the retina: near the temples
Temporal
