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Anatomy & Physiology > Transmission Of Light > Flashcards

Transmission Of Light Flashcards

1
Q

Which range of light do humans respond to

A

390-780nm (visible range)

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2
Q

Humans respond to light of 390-780nm as a result of:

A

The transmission properties of the eye (reflection,absorption,scatter)

The spectral sensitivity of photoreceptors

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3
Q

What does dioptric apparatus do

A

Transmits + refracts the viable light to focus it on the retina

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4
Q

What does the iris do

A

It regulates the intensity of light reaching the retina

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5
Q

What kind of eyeball will a myope have

A

Elongated eyeball

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6
Q

What kind of eyeball will a hyperope have

A

Eyeball too short or cornea too flat

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7
Q

What wavelength is Uvc light

A

100-280nm

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8
Q

What wavelength is uvb light

A

280-315nm

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9
Q

What wavelength is uva light

A

315-390nm

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10
Q

What wavelength is visible light

A

390-780nm

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11
Q

Describe the cornea

A

Provides a protective coating to the eye

Is an optical lens responsible for 70% of refractive power of the eye

Provides a transparent windscreen

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12
Q

What’s the major later of the cornea

A

Stroma

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13
Q

What is the stroma composed of

A

Mainly collagen

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14
Q

What light is absorbed by the cornea

A

Short wavelength UV light <295nm

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15
Q

What light is transmitted by the cornea

A

UV light >295nm visible and near infrared light

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16
Q

Describe the aqueous humour

A

Present mainly in anterior chamber of the eye
Provides the lens and cornea with nutrients
Formed continuously by ciliary body
Passes trough the pupil to the anterior chamber
Drains away to the venous system in the anterior chamber through the Schoenberg canal:trabecular meshwork
Intraocular pressure is influenced by rate at which aqueous humour is produced+drained away

17
Q

Glaucoma

A

Inc in ocular pressure result in changes in structure of the optic nerve head + effects on the visual field

18
Q

Iris

A

Responsible for the pupillary light reflex

19
Q

Rods and cones function as transducers

A

Absorption of light in the outer segment causes signalling to 2ndary neutrons through synaptic terminal

20
Q

OCT - optical coherence tomography

A

Seeing all layers of the retina in a patients eye

21
Q

LCA - Leber’s congenital amaurosis

A

Rapid loss of photoreceptors in childhood or young adulthood leading to blindness

22
Q

Age-related macular degeneration

A

Retinal degenerative disease that causes progressive loss of central vision.
Risk inc with age

23
Q

What will an eye with AMD have

A

Drusen
Atrophy
Subretinal hemirrhage

24
Q

What is retinitis pigmentosa

A

A group of inherited eye diseases causing degeneration of photoreceptor cells in the retina
Occurs progressively from outermost cells to innermost
Tunnel vision

Anatomy & Physiology (4 decks)

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