Lab 5 Flashcards

1
Q

Aqueous humor

A

Liquid in eye that provides nutrients to cornea and lens

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2
Q

Lens

A

Behind the cornea and pupil, retracts and focuses light

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3
Q

Suspensatory ligament

A

Holds lens, adjusts lens shape with ciliary body

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4
Q

Vitreous humor

A

Jelly like substance that maintains pressure on retina

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5
Q

Pupil

A

Adjusts light amount that reaches retina

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6
Q

Sclera

A

Site of muscle attachment, protects and anchors eye

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7
Q

Cornea

A

Refracts light

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8
Q

Choroid

A

Provides nutrients to retina

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9
Q

Ciliary body

A

Smooth muscle that adjusts shape of lens to bend light to fovea

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10
Q

Iris

A

Traps excess light, muscles that change size of the pupil

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11
Q

Ora serrata

A

Site where ciliary body meets choroid

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12
Q

Retina

A

Houses photoreceptors, responsive to light, phototransduction

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13
Q

Optic disc

A

Site if axons leaving eye, vessels entering, blind spot

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14
Q

Macula lutea

A

Site of many cones, contains fovea centralis

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15
Q

Fovea centralis

A

Focal point, highest density of cones (no rods), where bright light is focused to for sharpest resolution

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16
Q

Photoreceptors

A

Cones and rods in retina, responsive to light energy, relay signal to bipolar cells

17
Q

Bipolar cells

A

Neuron in chain between photoreceptor and ganglion cell

18
Q

Ganglion cells

A

Part of retina, Neurons that receive information from bipolar cells, axons make up optic nerve, carry signals to brain

19
Q

Blind spot

A

Optic disc, where the optic nerve exits the eye, contains no photoreceptors so light hitting this area is not seen

20
Q

Visual acuity

A

Ability to distinguish separate images in the visual field

21
Q

Astigmatism

A

A defect in an eye or lens caused by a deviation from spherical curvature which results in distorted images, light rays are prevented from meeting at a common focus

22
Q

Myopia

A

Nearsightedness, near objects are clearly seen but not far

23
Q

Hyperopia

A

Farsightedness

24
Q

Afterimages

A

Persistent signaling in the visual system despite removal of the stimulus, caused by ongoing bleaching of photopigments

25
Q

Bleaching

A

Photopigment degeneration caused by light stimuli, triggers signaling in the visual pathway

26
Q

Color blindness

A

Reduced ability to distinguish between different colors, inability to produce certain cone pigments or have functional cones due to genetic variation

27
Q

Accommodation

A

Changes in lens shape and pupil diameter to adjust for focusing light to appropriate areas on the retina for seeing clearly

28
Q

Convergence

A

Medial rotation of eyes for close up objects

29
Q

Depth perception

A

Ability to determine relative distance of objects in visual field

30
Q

Visual field

A

Area that can be seen with eyes and head in fixed position

31
Q

Optic chaism

A

Optic nerves merge, some fibers cross over

32
Q

Optic tract

A

Axons from optic chiasma to thalamus

33
Q

Optic radiation

A

Axons from thalamus to occipital lobe

34
Q

Visual field defect

A

Inability to see certain areas of visual field

35
Q

Lens shape

A

Distant objects: flattening of lens and pupil dilation
Close objects: pupil constriction and horizontal bulging of lens