rhodopsin  retinal + opsin

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Presentation transcript:

rhodopsin  retinal + opsin Light adaptation Dark adaptation

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

Controlling light

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

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

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

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

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

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