The eye Flashcards

1
Q

what is the pupil?

A

opening of the middle of the eye through which light passes

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2
Q

what is the iris?

A

a visible coloured ring at the front of the eye which adjusts to control the amount of light entering the eye through the pupil

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3
Q

what are the tear/locrimal glands?

A

they produce tears to clean and lubricate the front of the eye
fluid contains salt and has natural antiseptic properties to defend against infection

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4
Q

what are the aqueous and vitreous humours?

A

watery-jelly substance that fills the eye and helps it to maintain it’s shape and nourish it

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5
Q

what is the conjunctiva?

A

a thin membrane that protects the cornea

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6
Q

what is the cornea?

A

a transparent layer forming the front of the eye and light rays pass through the cornea to the retina

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7
Q

what is the retina?

A

the inner lining of the eye, it contains light-sensitive cells called rods and cones

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8
Q

what is the macula?

A

has photoreceptor cells that detect light and send signals to the brain which interprets them as images

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9
Q

what is the optic nerve?

A

where nerve cells exit the eye, there are no rods or cones here, = blind spot.

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10
Q

what is the ciliary muscle?

A

enables lens to change shape for focusing

contracts to stretch the lens making it thinner and flatter

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11
Q

what are the suspensory ligaments?

A

attach the lens to the ciliary muscle

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12
Q

what is the lens?

A

focuses the light entering the eye

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