Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
23 Cards in this Set
- Front
- Back
|
What are the 3 dimensions of light? |
Hue- dominant wavelength Brightness- intensity Saturation- purity |
|
|
Anatomy of the eye |
Orbits Sclera Cornea Pupil Iris Lens Vitreous humor Retina Fovea Optic disk |
|
|
Orbits |
Bony front of skull in which eyes are suspended |
|
|
Sclera |
-white outer coat of eye - hold eyes in place |
|
|
Cornea |
Outer layer of the eye |
|
|
Pupil |
Regulates the amount of light that enters eye |
|
|
Iris |
Pigmented ring of muscles situated behind the cornea |
|
|
Lens |
-altered by contraction of cilia muscles -changes shape and permit eye to focus on images of near or distant objects |
|
|
Vitreous humor |
-fills main part of eye -gelatinous fluid |
|
|
Retina |
Contains photo receptors |
|
|
Fovea |
-central point of the retina -responsible for most acute vision -contains only cones |
|
|
Optic disk |
-exit point from the retina -axons of the ganglion cells that form the optic nerve -responsible for the blind spot (no photo receptors) |
|
|
Photoreceptors |
-Receptors facing backwards -specialized neuron in retina -absorb protons -convert light to neural signals |
|
|
Types of photoreceptos |
-rods -cones |
|
|
Rods |
-very sensitive -easily bleached -concentrated in the periphery -poor acuity -useful in the dark |
|
|
Cones |
-not very active in dim light -essential for color vision -daytime vision -small features of the environment -highest acuity/ sharpness -located in fovea |
|
|
3 types of cones |
-red: long wavelength -green: medium wavelength -blue: wavelength |
|
|
What is a blind spot? |
Area of the eye where there are no photoreceptors |
|
|
Why do we have a blind spot? |
Due to the lack of Photoreceptors and presence of the optic nerve |
|
|
What is a Fovea? |
Central point of the retina where the cones are located |
|
|
Why do we have a fovea? |
For acute vision |
|
|
What happens if there is a Fovea dysfunction? |
It would cause color blindness |
|
|
What are the layears of the retina? |
1 cornea 2 iris 3 lens 4 vitreous humor 5 retina 6 fovea 7 cones 8 retinal or opsin 9 electrical signal 10 bipolar cell 11 ganglia cell 12 brain |
