Flashcards in Pathology of the Eye Deck (11):
What is the medical term for short-sightedness?
In myopia, where is the image focussed?
In front of the retina
What is hyperopia/hypermetropia?
Where is the image focussed in hyperopia?
Image focussed behind the retina
What is presbyopia?
Far sightedness due to age-related changes of the lens
What is glaucoma caused by?
Raised intraocular pressure because outflow of aqueous humour is blocked
What produces aqueous humour and where does it drain into?
Produced by the ciliary process
Drains into the scleral venous sinus via a trabecular meshwork
Movements of the lens for near vision?
-parasympathetic activity in oculomotor nerve causes sphincter-like contraction of ciliary muscle making the lens more globe-like/fatter
Movement of the lens for far vision?
No parasympathetic activity to ciliary muscles so lens is stretched, making it flatter
What is cataracts?
Clouding of the lens