Anatomy 1
Which part of the eye is an opening that light passes through?
The pupil.
What part of the eye makes a blind spot in our vision?
The optic nerve.
T or F: The images we see with our eyes are actually reflected light.
True!
When images are first formed on the retina, what position are they in?
Inverted (upside-down).
What procedure can be used to treat short-sightedness, farsightedness, and astigmatism?
Laser eye surgery.
Which part of the eye does light initially pass through and which helps to focus light rays?
The cornea.
What part of the eye captures light and turns it into signals that our brains can later process into images?
The retina!
T or F: Our eyes are tissues that are specialized for the sense of sight.
False: Our eyes are organs not tissues (they are made up of different tissues)
What part of the eye is responsible for producing sharp, straight-ahead, clear images?
The macula!
Which eye condition is often caused by an eyeball that is too short or a lens that is not curved enough and can be treated with a convex lens to focus light on the retina?
Farsightedness (Hyperopia)
Which part of the eye is responsible for near-sightedness and farsightedness (in some cases)?
The lens (can also be caused by the shape of the eyeball).
Which part of the eye helps us with detail-oriented tasks such as reading, driving, and watching television?
The macula!
T or F: We have 4 types of cones which each see a different color of light: red, yellow, green, and blue.
False! We have 3 types of cones for red, green, and blue light (primary colors).
Which two structures of the eye work together to focus light on our retinas?
The cornea and the lens.
Which eye condition is often caused by an eyeball that is too long or a lens that is curved too much and can be treated with a concave lens to focus light on the retina?
Short-sightedness (Myopia)
Which part of the eye is made of muscle and controls the amount of light which enters our eyes?
The iris.
What layer of tissue is made up of a network of blood vessels which lies in between the retina and sclera?
The choroid!
T or F: The cornea and sclera are both made of dense collagen connective tissue.
True!
What special cells detect the amount of light in our environment and help us see in the dark?
Rods! (Photoreceptor cells on the retina)
What condition causes the lens of the eye to become cloudy and may cause vision to be blurry?
Cataracts
Which part of the eye is opaque and gives the eye its shape?
The sclera.
What are the 2 functions of fluid in the eye? Name both types of fluid to get 500 points.
The aqueous humor (front of eye) and vitreous humor (back of eye) give our eyes nourishment and give them their inflated shape.
T or F: The optic nerve is a bundle of more than 1 billion nerve fibers that carry visual messages.
False! The optic nerve has more than 1 million nerve fibers (that is a lot of nerve fibers... but still a lot less than 1 billion).
How does our brain convert separate images from each eye into one accurate image that we see?
The brain takes in the visual information from each eye and uses this information to produce one accurate picture that we see. The difference in angles can help our brain determine how far away things are in our vision.
What condition causes light to be focused on two points of the retina, resulting in a blurred image?
Astigmatism