Lecture 11 vision 08.11.24

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Vision

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39 Terms

1

Vision

The process by which the eyes and brain work together to interpret light information.

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2

Sclera

The tough outer layer of the eye, transparent at the front (cornea).

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3

Choroid

A thin, pigmented layer next to the sclera that contains blood vessels.

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4

Lens

The structure that focuses light onto the retina.

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5

Iris

The colored part of the eye that regulates the amount of light entering the pupil.

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6

Photoreceptor Cells

Specialized cells in the retina that detect light; includes rod cells and cone cells.

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7

Myopia

A vision defect where distant objects appear blurred because they focus in front of the retina.

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8

Hyperopia

A vision defect where close objects appear blurred because they focus behind the retina.

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9

Retina

The innermost layer of the eye containing photoreceptor cells.

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10

Rod cells

Photoreceptor cells that are highly sensitive to light, enabling vision in low light conditions.

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11

Cone cells

Photoreceptor cells that detect color and function best in bright light.

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12

Rhodopsin

The photopigment in rod cells used for vision in dim light.

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13

Photopsins

The photopigments in cone cells that absorb different wavelengths of light.

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14

Accomodation

The process by which the lens changes shape to focus on objects at different distances.

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15

Ciliary body

Part of the eye that produces aqueous humor and controls the shape of the lens.

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16

Vitreous humor

The jelly-like substance that fills the majority of the eye.

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17

Optic disc

The location on the retina where there are no photoreceptors, known as the blind spot.

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18

Aqueous humor

A clear fluid produced by the ciliary body that fills the space between the cornea and the lens.

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19

Color blindness

A visual deficiency due to the absence or deficiency of one or more types of cone cells.

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20

Cation channels

Channels in the cell membrane that allow positively charged ions to enter the cell.

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21

Ganglion cells

The type of neuron in the retina whose axons form the optic nerve.

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22

Optic nerve

The nerve that transmits visual information from the retina to the brain.

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23

Optic chiasm

The point where the optic nerves from both eyes cross each other.

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24

Bipolar cells

Cells in the retina that transmit signals from photoreceptors to ganglion cells.

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25

Neural pathways of vision

The route that visual information takes from the retina to the brain.

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26

Depth perception

The ability to perceive the world in three dimensions and judge distances.

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27

Cilium

A hair-like structure that helps in various functions, but not typically found in photoreceptor cells.

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28

Electromagnetic spectrum

The range of all types of electromagnetic radiation, including visible light.

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29

Visual pigments

Light-sensitive molecules in photoreceptor cells that absorb light.

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30

Bleaching of rhodopsin

The process that occurs when rhodopsin is exposed to light, causing it to become inactive.

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31

Visual acuity

The clarity or sharpness of vision, often related to the ability to resolve fine details.

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32

Ciliary muscles

Muscles that adjust the shape of the lens for focusing.

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33

Retinal

A derivative of vitamin A that is part of the visual pigments in photoreceptors.

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34

Signal transduction pathway

The process by which a chemical or physical signal is transmitted through a cell.

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35

Action potential (AP)

A rapid rise and subsequent fall in the membrane potential of a cell.

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36

Lateral inhibition

A process where an excited neuron reduces the activity of its neighbors, enhancing contrast in sensory input.

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37

Phototransduction

The conversion of light into electrical signals in the retina.

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38

Conjunctiva

A mucous membrane that protects the front of the eye and keeps it moist.

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39

Fovea

The central region of the retina responsible for sharp central vision.

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