Vision Flashcards
(99 cards)
Optical component of the eyes
Cornea, aqueous humor, vitreous humor, lens
Neural component of the eyes
Rods, cones, bipolar cells, ganglion cells
Function of the optical component of the eyes
Focus images on the photoreceptors
Function of the neural component of the eyes
Transforms images that reach the photoreceptors into neural discharges which are transmitted to the brain
Primary refractive media of the eye
Cornea
Color of the cornea
Transparent to allow the light pass through
Why is the cornea transparent
Uniform structure, avascularity, deturgescence (stroma of the cornea is kept dehydrated to maintain clarity and transparency)
Metabolism of the cornea
Glucose, aerobic (30% glycolysis, 65%PPP)
Two parts of the conjunctiva
Palpebral: behind the eyelid (check color; pale = anemia)
Bulbar: covers the sclera
Fibrous outer layer of the eye consisting of collagen
Sclera
Fine elastic tissue covering the outer anterior sclera
Episclera
Nourishment of sclera
From blood vessels of episclera
Parts of the uveal tract
Iris, ciliary body, choroid
Central opening of the iris
Pupil
Function of the pupil
Controls amount of light entering the eye
Pupillary response to bright light
CN III; sphincter pupillae; miosis (constricted)
Pupillary response to dark light
Sympathetic; dilator pupillae; mydriasis (dilated)
Two zones of the ciliary body
Pars plicata: corrugated anterior zone
Pars plana: flattened posterior zone
Function of the ciliary body
Controls conformation and focus of the lens through the suspensatory ligaments; produces aqueous humor
Posterior part of the uveal tract, located between the sclera and the retina
Choroid
Function of the choroid
Supplies blood to the outer portion of the retina
Blood supply of the inner part of the retina
Retinal arteries
Blood supply of the outer part of the retina
Choroid
Biconvex, avascular, clear structure of the eye
Lens