Intro to Vision Flashcards
What muscle opens your eyelid?
Levator palpebrae superioris
Visual pathway
Cornea Anterior chamber Pupil Posterior chamber Lens Vitreous body Retina Optic disc
Conjunctiva
Transparent mucous membrane
Lines the inner surface of the eyelids and surface of the globe up to the cornea
Tear film and defense barrier against infection
Sclera
Structural support of the eye
Collagen bundles of varying sizes
Vascular connective tissue
Necrotizing scleritis
Cornea
Transparent avascular dome-shaped layer anterior to the iris and pupil Refracts light (2/3 of the eye's refractive power) Has 5 layers
Anterior chamber
Space between iris and cornea
Filled with aqueous humour
2 layers of the iris
Anterior stroma (iris colour, muscles) Posterior epthelium
Lens
Biconvex Avascular Transparent Enclosed by capsule Suspended by zonules connected to ciliary muscles
Ciliary body
A ring-shaped thickening of tissue that extends from the root of the iris to the vitreous body
Ciliary muscle changes the shape of the lend
Ciliary epithelium produces aqueous humor
Aqueous humor
Transparent, water fluid
Similar to plasma, but low protein concentrations
Provides oxygen, nutrients and metabolic waste removal for the lens and cornea
Flow of aqueous humor
Ciliary body Posterior chamber Pupil Anterior chamber Angle Trabecular meshwork Schlemm's canal Episcleral veins
Vitreous body
Clear gel that fills the space between the lens and the retina
Liquifies and collapses with age (get floaters)
Optic disc
Where the optic nerve exits the eye
Retinal vessels enter and exit the eye
Myopia
Near sightedness (can’t see far away)
Hyperopia
Far sightedness (can’t see near or far away)
