Eye and Vision Quiz Flashcards
What is the function of the Eye?
The Eye works in light refraction in order to capture light, bounce it around through its various layers, eventually hitting the retina to display vision to the brain
What are the overall Steps of Vision? (5 steps)
- Light is captured/bent by Cornea
- Passed through Aqueous Humor
- Enters through the Pupil, controlled by the Iris
- Lens directs light to Retina, and it passes through Vitreous Humor
- Finishes with hitting the Retina
What is the overall structure/composition of the Eye?
The Eye is primarily composed of many Rods and Cones, Rods picking up low energy/gray light and Cones pick up high energy/color light
What are Rods?
Parts of the eye that are found around the edges of the Retina. It picks up low energy light, only gray/black and white, and allows peripheral vision
What are Cones?
Parts of the eye that are found densest in the Retina’s center. They allow detailed sight and color vision. “C for Color”
What is “20/20 Vision?”
The idea of the Eye being set for distant vision, or 20< feet away
What is Accommodation?
The Eye lens closing to focus on closer objects 20> feet away, or opening to focus on objects 20< feet away
What MUST benders of light be?
‘Lightbenders’ MUST be solid structures!
How many parts of the Eye refract light? What are they?
The Eye has 4 light refactors. They are:
- The Cornea
- Aqueous Humor
- Lens
- Vitreous Humor
What are the names for the two most common Eye problems? (Nearsightedness and Farsightedness)
- Myopia (Nearsightedness)
- Distant objects are blurry and
near ones are clear - Light from objects are brought
to point before they hit The
Retina - CAUSED BY AN ELONGATED
EYE
- Distant objects are blurry and
- Hyperopia (Farsightedness)
- Closer objects are blurry and
far ones are clear - Near objects do not spread
light in time to hit the Retina - CAUSED BY A SHORT EYE
- Closer objects are blurry and
What is Emmetropia?
The term for when Eyes are structured and function normally/as intended
What is the Sclera? What is its function?
Outermost tunic of the eye. It protects the Eye
What is the Cornea? What is its function?
The most outer part of the front of the eye, it is transparent and covers the Iris and Pupil. It captures and allows light to enter the Eye
What is Vascular Tunic or Choroid layer? What is its function?
The middle layer of tissue surrounding the Eye, it is nutritive tunic. It captures light with its dark pigment, preventing it from scattering. It is red and muscly
What is Sensory Tunic or Retina? What is its function?
The most superficial layer of tissue surrounding the Eye. It is a tunic that contains millions of receptor cells (Rods & Cones) to receive outside light. It is yellow and veiny
What is the Lens? What is its function?
The clear, elliptical structure that sits behind the Iris. It transmits light and focuses it on the Retina. It looks like an oval with a jawbreaker-like design
What is the Iris? What is its function?
The colored tissue at the front of the eye which holds the pupil between it. It controls the Pupil’s opening and closing, regulating the amount of light which enters the Eye
What is the Optic Disk? What is its function?
Also known as the blind spot, the Optic Disk is located at the posterior back of the eye, within the Vitreous Humor. It is the part that transmits visuals to the brain, allowing vision. It is the opening to the stem behind the eye
What is the Fovea Centralis? What is its function?
A small, dark depression near the anterior back of the Eye, it is round. It plays a giant role in allowing/controlling central vision
What is Aqueous Humor? What is its function?
The clear fluid which fills the space between the Cornea and Lens/Iris/Pupil. It nourishes the Eye and helps refract light
What is Vitreous Humor? What is its function?
The transparent fluid which makes up the interior of the eyeball, behind the Lens. It nourishes the Eye and helps it keep its shape. It also aids in light refraction from the Lens to the Retina
Which part of the Eye focuses light on the Retina?
The Lens
Which part of the Eye transmits visual impulses towards the Brain?
The Optic Disc (blind spot), this small hole allows optic nerves to fire towards the brain, which is why we cannot see light that hits that part
