SPECIAL SENSES. THE EYE Properties of light External eye –Palpebra –Eyeball –Protection provided by – –Meibomian glands (eyelashes) –Conjunctiva –Lacrimal.

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Presentation transcript:

SPECIAL SENSES

THE EYE Properties of light External eye –Palpebra –Eyeball –Protection provided by – –Meibomian glands (eyelashes) –Conjunctiva –Lacrimal glands

EYE MOVEMENTS 3 pairs of muscles Medial rectus Lateral rectus Superior rectus Inferior rectus Superior oblique Inferior oblique

Internal Eye 3 tissue layers + 2 fluid filled cavities 1)Outer, fibrous tunic 1)Sclera “Canal of Schlemm” 2)Cornea 2)Middle vascular tunic 1)Choroid 2)Ciliary body (ciliary muscles + ciliary process) 3)Lens 4)Iris

3)Inner retina or nervous tunic 1)Photoreceptor cells 1)Rods (rhodopsin) 2)Cones (cyanolabe, erythrolabe, chlorolabe) 2)Fovea centralis (cones only) 3)Optic disk 4)Macula lutea

CAVITIES 1.Anterior 1.Aqueous humor 1.Ciliary process 2.Canal of Schlemm 2.Posterior 1.Vitreous humor

LENS Changes shape and focuses light onto retina Accommodation

DISORDERS Myopia

Hypermetropia Astigmatism

Cataract Glaucoma Presbyopia Color blindness online.com/objects/ViewObject.aspx? ID=AP14304