Week 5 Flashcards
Palpebral Fissure
Open Space between eyelids
Extraocular Structures (external)
Extraocular muscles to control eye movement and hold eye in place
Intraocular Structures: 3 Layers
1) Outer fibrous layer: containing sclera and cornea
2) Vascular middle layer: iris, ciliary body, choroids
3) Inner neural layer: retina
Protanopia
Difficulty distinguishing blue from green and red from green
Tritanopia
difficulty distinguishing yellow from green and blue from green
Deuteranopia
difficulty distinguishing red from purple and green from purple
Achromatopsia
complete color blindness (a rare condition, in which only shades of grey are visible)
Myopia
Nearsightedness
Hyperopia
Farsightedness
Presbyopia
Decreased ability to focus on near objects, a common occurrence with aging
Astigmatism
Blurred Vision
Retinal Detachment
Sudden loss of vision, associated with age, Emergent situation requiring immediate intervention
Macular Degeneration
breakdown of cells in macula of retina; loss of central vision. Lateral vision is unaffected (Leading cause of blindness for older adults, in Canada)
Cataracts
Lens opacity
Glaucoma
results from increased intraocular pressure: causes damage to the optic nerve and gradual loss of peripheral vision
Second most common cause of irreversible vision loss in older adults in Canada
Diabetic Retinopathy
an eye condition that can cause vision loss and blindness in people who have diabetes- leading cause of visual impairment in those younger than 65
Conjunctivitis
Inflammation of the conjunctiva with purulent discharge
Sty
Bacterial infection in a sebaceous gland on the eyelid
Ptosis
Drooping upper eyelid
External Ear
Ends at Tympanic Membrane - guides sounds to the meatus
Middle Ear
Eustachian Tube - Dampens sound to protect inner ear