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science eyes Flashcards

0
Q

Name the 8 parts of the human eye.

A
  1. Ciliary muscle
  2. Cornea
  3. Pupil
  4. Lens
  5. Iris
  6. Retina
  7. Blood Vessels
  8. Optic Nerve
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1
Q

The eye is a ________________ technology that uses a ______ to form images.

A

Image producing

Lens

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2
Q

Light either travels from a source to your eyes, or reflects off an object to your eyes. Light travels into the eye opening called the _______. The pupil is a hole created by a circular band of __________ called the _______. The iris ________ The size of the pupil depending on how much light is in the surrounding environment.

A

Pupil
Muscle
Iris
Controls

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3
Q

In dim light the pupil _________. In bright light the pupil __________.

A

Dilates

Constricts

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4
Q

Light passes through the ________ entering the eye through the ________________.

A

Corned

Pupil/Iris

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5
Q

The __________ muscles contract and relax to change the shape of the _______. This allows light to __________ properly.

A

Ciliary
Lens
Focus

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6
Q

Light focuses on the ___________, stimulating the _________________ located there.

A

Retina

Photo Receptors

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7
Q

Cones detect __________ and rods are highly _____________ to ________.

A

Colour
Sensitive
Light

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8
Q

Photoreceptors send a message to the ________ _______, which passes the message to the brain.

A

Optic Nerve

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9
Q

Images are formed in cameras in a very similar way. This is why human and other mammalian eyes are classified as _________ eyes.

A

Camera

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10
Q

The ______ on a camera is like the retina of the eye.
The diaphragm on a camera is like the ______ on the eye.
The ___________ on a camera is like the pupil of the eye.
The lens on a camera is like the ______ of the eye.
The black paint on a camera is like the _________ of the eye.

A 
Film
Iris
aperture
Lens
Choroid
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11
Q

Many people have difficulty seeing because they are unable to effectively _________ light on the retina. The __________ ___________ are not able to effectively reshape the lens.

A

Focus

Ciliary Muscles

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12
Q

What is the other word for farsightedness?

A

Hyperopia

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13
Q

What is the other word for nearsightedness?

A

Myopia

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14
Q

People who are farsighted cannot see ________ objects clearly. The eye cannot make the lens ______ enough to focus light and the image falls _________ the _________.

A

Close
Fat
Behind
Retina

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15
Q

The ________ lens helps to ___________ the light so that is focuses on the retina.

A

Convex

Narrow

16
Q

People who are nearsighted cannot see __________ objects clearly. The eye cannot make the lens ________ enough to focus light and the image falls __ ________ of the retina.

A

Distant
Thin
In front

17
Q

The __________ lens helps __________ light out so the image extends to the retina.

A

Concave

Spread

18
Q

Surgeons can use lasers to reshape the _________. As you recall from the dissection lab, the cornea is the thick outer layer that protects the eye. By reshaping it, the cornea acts like a __________________ _____.

A

Cornea

Corrective lens

19
Q

_______ __________ ____________ are a useful piece of technology that aides our vision in low light. These goggles work in the following ways:

  1. Light is focused onto an image _______________
  2. Inside the intensifier, the light __________ releases a stream of particles.
  3. The partials hit a __________-coated screen
  4. The _____________ glow green when the partials strike them.
  5. The person wearing the goggles sees a green glowing image.
A 
Night Vision Goggles
Intensifier
Energy
Phosphor
Phosphors
20
Q

Light travels in _______ that determines properties such as color.

A

Waves

21
Q

What does ROY G BIV stand for?

A

Red orange yellow green blue indigo violet

22
Q

The longer the wavelength= _______ frequent

Shorter the wavelength = ________ frequent

A

Less

More

23
Q

Bioluminescent= chemical reaction creating ___________. Created by ___________ that produce light.

A

Photophores

Bacteria

24
Q

Phosphorescent light=glow in the dark. Used in night _______ _______.

A

Vision goggles

25
Q

Most __________ have camera eyes. The structure of the eye varies depending on how the animal uses it.

A

Vertebrates

26
Q

Name 2 differences between the human eye, the fish eye, the avian eye, and the cat eye.

A

Humans have three different cones that let us see three colors, blue, green, and red. Humans have camera eyes. Fish have lenses that stick out through the pupil. Because the pupil sticks out, fish can see in almost every direction. Birds have five different cones. Birds have much sharper vision then humans so that they can see their prey while in the air. Cats have very large pupils and have a layer of tapetum at the back of their eyes that helps them see.

27
Q

Insects and crustaceans have compound eyes. If you look closely at these creatures, you will see that each eye is made up of _______ smaller units called _______________. When all the lenses are attached to one another they become _________________.

A

Many
Ommatidia
Ommatidium

28
Q

Name the parts of a ommatidia.

A 
Lens
Focussing cone
Light sensitive cells
Pigment cells
Nerve to brain
29
Q

Compound eyes are great at spotting _____________. Despite this, having __________ lenses makes it difficult to form a single, coherent ___________. The image formed is referred to as a “__________ _________” because it is made up of lots of small dots of light.

A

Movement
Multiple
Image
Mosaic Image

30
Q

What’s a stadium image and how is it like digital images?

A

Stadium images are created when large groups of people hold up colored card, depicting an image. They are like digital images because they both use the same principle.

31
Q

What is the words “pixels” short for?

A

Picture elements

32
Q

Images that have a ________ number of pixels will have a ________ _________ and be of better quality. Images that have a _________ number of pixels will have a ___________ _______ and be of poor quality.

A

Greater
Clear image
Low
Blurred image

33
Q

If you are working with a large image on a computer, how can you improve the quality of it?

A

You can make the image smaller

34
Q

If you are working with a small image on a computer, what might happen if you try to enlarge it?

A

The quality of the photo will descend

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