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BIOL 153 (51)
Lecture

Sight Notes.docx

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Department
Biology
Course
BIOL 153
Professor
Robert Harris
Semester
Summer

Description
Sight Notes Sight  The pupil is actually a lack of tissue  Iris (the colourful part of eye) : variable in size, regulates light by contracting and becoming bigger  Eyelashes: top and bottom, there for protection from dust  Eyebrow: protective from sweat and particles  Fold of eye: at the edges of eye, where eyelids meet o Outside edge = lateral cantus o Inside edge = medial cantus  Lacrimal caruncle: drain tear liquids into the sinus  Lacrimal gland: just above the fold, makes tears (tears = salt water), drains flud onto the eye on the lateral side Tears  Water, 0.9% NaCl, other components (fatty acids, modified phospholipid)  The fatty acids/modified phospholipids produce an oily film barrier with the water. The heads of the phospholipids face the water, tails face the air. This prevents the evaporation of the water (by keeping it separate from the air)  Tears do evaporate but it takes a long time = that’s why we can keep our eyes open Parts of the eye (pretty sure I spelled a lot of these wrong, refer to diagram of the eye for spelling)  Rectus muscle: lateral movement  Superior/inferior oblique muscles: allow for rotation, very pronounced in humans because we walk on two feet so our bodies angle as we walk therefore rotation allows for good view  Upper/lower conjunctive: pink eye = swelling of this location, fusion with outer surface of the eye and eye lid  Sclera: white part of the eye, blood vessels here  Optic disk: blind spot, no photoreceptors here  Fovea: back of the eye, center of field of view, image is focused here, increased density of photoreceptors mostly cones - Photoreceptors: cones= colour, rods=black/white  Cornea: clear, curved to bend light, part of focusing  Anterior chamber: filled with fluid = aqueous humour  Lens: held in place by tendons = suspensory ligaments  Posterior cavity: filled with the vitreous humour which is jellylike - Vitreous humor does not come up to the lens because lens changes shape (thicker/thinner) if vitreous humor touched it, lens would be damaged therefore the lens is surrounded by the aqueous humor  Iris: tries to control the amount of light with the muscles  Canal of Schlem: the fluid (aqueous humor) is made by ciliary body and is then drained here. The fluid then mixes with lacrimal fluid and leaves by the lacrimal canal  The pressure of the eye must be kept co
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