Eyes, etc
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| Eyes | Have 3 tunics, 2 humors, and secretions. You can only see 1/6th of the eye, the rest is covered by fat and bones. 70% of all sensory receptors are located in the eye.
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| Lacrima | (S) secrete saline solution through canals (nasolacrimal duct --> nasal cavity) *contains antibodies & lysozyme
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| Conjunctiva | (S) covers outer surface of eye; secretes mucus
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| Conjuctivitis | pinkeye
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| Ciliary | (S) modified sweat glands between eyelashes (watery)
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| Meibomian | (S) sebaceous glands on eyelid edges (oily)
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| Aqueous | (H) anterior to the lens; clear, watery
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| Glaucoma | blocked drainage of aqueous humor; increased pressure --> pain, blindness; symptoms (slow to show) arehalos, headaches, and blurry vision
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| Vitreous | (H) posterior to lens; gel-like
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| Chloroid | (T) blood rich, dark pigment, keeps light from scattering; anterior to Iris
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| Fovea Centralis | (T) lateral to optic disc; has only cones; gives you sharpest vision
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| Retina | (T) sensory, delicate, white, abalone-esque, contains millions of receptors
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| Rods | (part of retina) give you "night-vision;" beta-carotene is very good; densest at periphery
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| Cones | (part of retina) give you color vision, details; densest at center
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| Colorblindness | When one or more of the cones which filters only green, blue and red light, does not work
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| Optic Disc | (part of Fovea Centralis) no photoreceptors where optic nerve leaves retina
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| Lens | focus light on retina (flexible biconvex structure); attatched to ciliary body by ligaments; lets you focus
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| Cataracts | when the lens becomes hard, opaque; symptoms are: hazy vision, blindness
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