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rhodopsin  retinal + opsin

Published byHester Walton Modified over 5 years ago

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Presentation on theme: "rhodopsin  retinal + opsin"— Presentation transcript:

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2 rhodopsin  retinal + opsin
Light adaptation Dark adaptation

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12 Sclera Choroid Rectus muscle Retina Ciliary muscle Fovea Optic disc Aqueous humour Conjunctiva Optic nerve Blood vessels Cornea Pupil Vitreous humour Canal of Schlemm Lens Iris Suspensory ligament

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14 Controlling light

15 Bright light Circular muscle contracts Radial muscle relaxes
Iris ring closes Pupil is small

16 Dim light Circular muscle relaxes Radial muscle contracts
Iris ring opens Pupil is large

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18 Accommodation Rays from a point on a far object
Rays from a point on a near object

19 Far object Ciliary muscle relaxed Ciliary ring opens Ligaments go taut
Lens pulled flat

20 Near object Ciliary muscle contracts Ciliary ring closes
Ligaments go slack Lens more spherical

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